Pratica di Shadowing: DejaVue #E001 - The Need for Server-Side Rendering (SSR) - Impara a parlare inglese con i video

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Welcome to Deja View, your favorite view podcast.

You just don't know it yet.

And here with me on the microphone is Michael.

I am a full -time view educator and produce lots of content,

newsletters, things like that, including this podcast, which I record with Alex.

Exactly.

And I'm part of the Next Core team.

I'm also creating quite some content on YouTube stream every now and then Twitch.

And I am a web engineering consultant by day.

And today we talk about a topic that might be interesting for most of you, which is server -side rendering.

What is it?

Do you need it?

Why would you use it?

And what are all these other weird acronyms in that space?

Yeah, so let's start with what is server -side rendering to begin with? just

so that we can start off on the same page.

And some of you may not know what it is or the exact specifics.

So what would your definition of server -side rendering be?

Well, I mean, we could go all the way back and say, oh yeah, my old PHP application is server -side rendered because,

oh, there's a PHP server and it renders the HTML.

But if we are in the JavaScript ecosystem and if we talk about single -page applications,

then server set rendering means rendering your single page application on the server, mostly a node server, on the initial request.

That's very important.

So only if you like hard reload the page or if you click from an external source,

like from Google, then your site will be server rendered.

And ideally afterwards, it will just behave as a plain old single page application as before.

Yeah, it's interesting to think about historically that websites have almost always been server -side rendered.

Like if you go back to the 90s, we had JavaScript back then,

but we weren't really building single page apps that just lived in the browser.

We were always hitting the server with every single request, button click, that kind of a thing.

Yeah, absolutely.

I mean, then Ajax came and said like, hey, JavaScript can do a bit more here and there.

But we're still, in a way, we're still torn of like, oh yeah, the server still renders things and we can load more.

And there was XML and then finally some good thing like JSON so we can send data.

And yeah, eventually SPAs were born by saying, why can't we do all of the things in the browser

and front end and like use the backend more as an API?

Yeah.

And this pendulum almost swings back and forth,

it seems between single page apps are the hottest thing.

And then, no, they're terrible for performance.

They've got all these issues.

Let's render everything on the server.

And then, you know, after a couple of years, people are like wait but we can do

so much more with single page apps

so let's you know the the pendulum swings back the other direction

and it almost seems like a bit of uh whiplash

we've gotten in the web development community here yeah it's true

but i think we can't do without both like ideally in the future we have something where the server

and the client they work together hand in hand you embrace the web standards

and i like to see some moves for example what remix is doing with like, okay, we basically have a single page application,

but we progressively enhance it.

Even without JavaScript, you can still send forms.

So that's super interesting to see.

And also what

React is doing with server components and what Nux server components are doing to say,

like we reduce the amount of JavaScript we need to render some stuff.

And from there, we can improve performance -wise, but also still keep the same mental model of the same framework, not the same code we write.

And I like what Nuxt does with the hybrid approach where we try

and take the best of both worlds of server -side rendering and single -page apps and basically stay right in the middle.

I mean, you could argue if it's leaning one direction or the other, but where we use server -side rendering on that first request,

and then after that, we can bootstrap into a single page app and get the benefits there.

So I think that's a pretty neat way to sort of blend the two.

But yeah, what are your thoughts on that?

I also think it's really helpful, but of course introduces some more problems.

Let's say you have more complexity because you always have to think, oh, what if this is rendered on the server?

For me, like I remember back in 2017, maybe 2018, something like that, must be 17, when I first got in touch with Nuxt,

I was like, okay, service -led rendering, super helpful because back then I had a project with public facing.

And as we all know, single -page applications, well, they don't run out HTML straight away.

The JavaScript generates it, and that's not so nice for search engines.

So I thought, okay, service -led rendering will solve all my problems.

And it did, but it introduced some more like, okay, when does that server rendering actually happen?

Is it every request?

And as just mentioned, it's just the initial one, but it's another concept to understand.

So when would you recommend that someone uses server -side rendering in their application? So maybe,

I guess the more standard approach of building view applications has been And before Nuxt became as popular as it is now,

the standard was to build these view single page applications.

And the one place that I worked at, we actually used

Ruby on Rails, which is a server -side rendered framework.

But it actually bootstrapped itself into this single page app where that initial page render was done with Ruby on Rails,

but then now we've got a Vue single page app that's running.

What would you say are the reasons you would want to switch to server -side rendering?

Or how would you think about that?

Because you did mention there are some tricks or catches there with server -side rendering.

Yes, absolutely.

So if you use Vue more

or less as progressive enhancement of like okay i want to do some interactivity

but i don't render my full front end in it then switching to server -side rendering is almost impossible

i know there were some projects saying oh yeah maybe we can do the v8 engine

and php and whatnot but it never really took off um

and in that case yeah render your page in in rails

or in laravel or django whatever

and then use view on top of it it's totally fine

but as soon as you have the whole front end under the control view,

then it really makes sense thinking about server -side rendering when you need search engine optimization.

So if it's like a public page you want to share and when it's performance critical.

So typically any kind of landing page, any kind of e -commerce,

that's always a very tricky area because lots of things to show has to be very like recent updated data.

And that's like the classic example where server -side rendering helps.

But even for your blog or portfolio page, they just want to put out there, then service -led rendering makes sense.

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But now that I think about it, we can't even go the other way around.

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We're saying if your application is behind authentication, then we don't really need service -led rendering at all because no third -genge will ever hit that.

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And, well, people have to log in anyway and to wait a little bit.

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So that's not a big of a deal.

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So as long as it's not public -facing, no service -led rendering is needed.

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And it's also important to mention that you don't have to turn on the switch

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or turn it off for service -led rendering for your application.

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You can also say, oh, hey, I have routes, let's say, slash admin, and everything starting with slash admin should not be server rendered because it's,

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well, the admin area.

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But hey, my blog page should be server rendered.

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So you can also make sure that you have a nice fine -grained structure saying, okay, that part should be server rendered and that part shouldn't.

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But even if you had, And for example, this admin section that's behind authentication,

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wouldn't you still get some performance benefits from having it server -side rendered?

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I guess it would depend on what exactly that page is rendering.

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Yeah.

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So you would definitely have a better perceived performance because what happens in detail during server -side rendering is,

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okay, you send a request and the server returns the HTML.

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So you see straight away, okay, this is what the page will show.

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It also ideally includes some inline CSS.

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So I actually have the styles too.

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And then the JavaScript is also sent, but that will be downloaded, executed, parsed, and then Vue and Knox will boot up

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and basically go through the send HTML and more

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or less convert it over to like Vue's representation to Vue's own VDOM representation and then for interactivity, attach some listeners.

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And that whole process from, okay, I see the HTML,

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but right now it's not interactive because there are no listeners and Vue is not up yet.

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Until the point where it's up, that's called hydration.

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Very important process.

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And it's a little bit intensive, especially CPU intensive, if you have like a big page or like very complex components.

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And while the perceived performance could be better for people saying, oh yeah, I see the page you might have the problem

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that they want to click something but they can't

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because the listener isn't there yet and there are also ways to improve

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that but i think that's something to keep in mind yeah you could improve performance with ssr

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but then you have to make sure that the hydration cost is low

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that you can ideally delay that or say hey these parts shouldn't be hydrated and so on and so on

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right and which is why nuxt has

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that um hybrid mode where it switches between the two yeah exactly

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and you can even go further

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there are ways to delay the hydration to say okay as soon as i interact

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or scroll then i want to actually do hydration

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so you have a better first um like the first page load is faster

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you get a faster largest contourful paint is one of the metrics that's relevant there.

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But then you have to be very careful because there's another metric called interaction to next paint, which is a core web vital, same to LCP.

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And that basically says, oh, if you click something, how long does it take until the UI shows something?

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And if you say, hey, on click, I want to do the whole CPU intensive hydration part,

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it might reduce the value there, causing troubles.

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Also because your users, okay, click, and I wait.

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maybe on your, I don't know, MacBook M2, like with all the fancy devs having that, it's like no problem.

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But if you're on a mobile device, or maybe it's also an older device with German cell phone reception and mobile data,

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which means it's not that nice, then it might take longer.

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And people are like, oh, I clicked.

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Why does nothing happen?

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I click again.

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And maybe people are frustrated and don't know what's going on.

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That's an interesting point to bring up with with single page apps versus server side rendering,

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where you have control over the server and how fast it is.

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You don't have control over the network speed.

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And you also certainly don't have control over your user's devices, whether they're on my phone,

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which I still have an old iPhone 6S, which is like, I don't know, eight years old now.

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And certain websites are very, very slow because probably the dev was like, whatever, it's fast on my machine.

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And so the single page app on that case,

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you're offloading more of the processing and those things to the end user's device versus on the server.

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So yeah, that's an interesting trade off to consider.

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Absolutely.

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And the problem is if you have that hydration part in Vue especially, what Vue is doing is it's doing the same thing on the server,

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but again, because you want to get to the point where the client is in the same state as the server.

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So the client will get some values from the server, but also has to build up all the components again.

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And other frameworks, like for example, there's Qwik, that's an experience of free zoomability.

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And there are also lots of lots of other ways of dealing with hydration or saying, hey, I use island architecture,

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which for example, Iris or Astro is doing saying,

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okay, there are parts that are not really necessary to hydrate and other things that should be interactive.

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I want to hydrate them and not all aesthetic content.

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That's something I'm very interested in, especially in the view space to see where this is going.

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Yeah.

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Some of these frameworks have some really interesting approaches with how they very incrementally,

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like progressively do that without having to load a whole bunch of stuff.

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It's just like on demand,

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which is, it kind of breaks my brain to think about because it's a totally new way of thinking about these things.

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And it once again brings other complexity, like, oh yeah, if you don't have to do the whole,

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like if you don't have to replay or do the same things on the client as on the server,

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and let's say you send a console log on the server and think, why doesn't that appear on a client?

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You also have to teach developers these concepts.

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So the problem is not only like, okay, hydration is kind of solved, let's say,

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but how you actually teach people how that works

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or make a nice abstraction around that is yet another issue to be solved.

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Yeah, and it's one of the trickiest parts of using Nuxt

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that I've found is that server -side rendering introduces these different complexities because you're running it once on the server,

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but you're not running it exactly the same as it would run on the client.

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And so if you're used to just like client side single page apps,

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then you have to shift your thinking quite a bit to be like, okay, it's going to generate this payload and...

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I want things to sync up properly.

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This part, you know, certain lifecycle hooks are not run on the server even.

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And why am I getting this weird bug?

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Because, oh, it did something on the server, but it's not doing it on the client.

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And then, you know, there's, I find most of the bugs and weird things that I come across for my,

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like when I'm writing my own code is,

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has to do with that maybe because I'm like already comfortable with the view specific side of things and I'm still,

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you know, my brain is still taking a bit to get around to the next way of doing things.

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I think it's very common.

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And just a quick mention here, you can even run your own server -side running setup with something like

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Vibe, which was previously Vue plugin, no, sorry, Vite plugin SSR, or even rolled fully on your own.

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Or you can even use Quasar, which also supports it.

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But in the most common scenarios, yeah, if you use SSR in view,

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then you rather don't want to roll your own because it's painful and you have to deal with all the issues that,

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well, Naxx is already solving for you, let's say.

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So that's one thing.

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And the other issue, yeah, of course, the complexity, especially with, okay, which data has to go from the server to the client?

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How can I mark the data so it goes over there?

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Or like, what are these weird hydration errors which are always coming up?

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Yeah.

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And I know it can be tricky because you go for, oh yeah, I'm doing everything in the client.

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It's fine.

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A little bit of window here, a little bit of document, dot query selector here.

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Please don't.

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But I use this chart library here, no problem.

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Yeah, on the server.

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It isn't that easy because there's none of that there.

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No window, no document.

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And that's something definitely worth dealing with and understanding.

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Like not into every tiny detail, it's fine.

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But having that idea how the process of server -side rendering, what we just talked about, works, that it's only for initial request.

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And that's, yeah, the complexity shouldn't be underestimated.

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So another similar term is SSG.

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So we've got SSR, we've got SPA, and we also have SSG.

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And I have been confused about these terms, especially because they're kind of used interchangeably almost it seems.

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And the acronyms are so close together.

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And I've also seen other people confused about like, what is the difference?

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What do these things mean?

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Why, you know, if I run Nux generate, why is it doing this and not this other thing?

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And so, yeah, let's explain what that acronym is and what it means.

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Yes, that's a great idea.

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Maybe let's turn it around this time.

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Maybe you go for it, explain it.

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And if I have anything to add, then I'll come after you.

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Sure.

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So SSG is static site generation.

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Is that what it stands for?

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Absolutely.

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Good.

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I was going to say server -side generation, which wouldn't be completely wrong.

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Well, it's close to that, actually.

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Maybe that would confuse less people.

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But yeah, anyway.

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Yeah, and

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so there's a difference between a server -side rendered application where it's still being rendered dynamically every time you hit that page.

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Whereas a static site is exactly that.

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It's static, it's not dynamic like this is for things like blogs or other documentation sites,

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things like that where the content doesn't change or need to be dynamically generated based on different requests.

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And so we can actually generate this ahead of time.

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Another word that's often used is pre -rendered.

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Maybe that's why it adds to the confusion because there's so many different terms that describe these very similar concepts.

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And so, yeah, there's this distinction between, do you need to generate it dynamically?

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If yes, you have, you know, are you generating it on the server or on the client?

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If it's not dynamic, you can do it statically.

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And then you're going to do it on the server in some way.

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And there's, again, many ways of doing this.

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You can do it at build time.

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You can build all your pages or render all the pages ahead of time,

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which is what I do for my blog because it's straightforward and it works.

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But you can also do different kinds of building where you...

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incrementally build it over time.

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And yeah, it gets complex.

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Oh, exactly, exactly.

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But yeah, I think that's a very good summary of static site generation, also known as pre -rendering, because these two things are exactly the same.

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What I like to say about it is always think of, as you said, server -side rendering, but not on the fly,

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not dynamically, because it's the static side.

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So server -side rendering at build time, like as you said, ahead of time, before it goes to the server.

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The good part is you get out static assets so you can host them everywhere.

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Very lovely.

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You don't need any kind of API connection unless you call APIs on the client side.

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Like, oh yeah, you can submit a comment and that should go into the database.

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You need that.

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But if it's just about content that you, for example, grab from a CMS,

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then you don't need an API connection because what Nuxt will do in this case,

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it will take all the requests and it will create the payload and save that as well.

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So some kind of JSON that's a bit compressed

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and we'll put in all the data there so you don't need to do the API call again somewhere.

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Because that would also be weird, like, okay, you have the data.

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Actually, it was like that in Nux2 like years ago for a while.

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Like it was like, okay, you got the data.

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And then when you do a client -side request to another page, it will fetch the API again.

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And if you refresh the page, the data, the content might be different.

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But yeah, luckily we got over that.

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and there was like a full static mode back then

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and this is also the default now when you use NUX3 with npx NUXE generate.

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Right.

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And it's super useful for applications and even

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if you say I want to start to generate a site

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but turn off server set rendering

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and you just generate one route then you have your single page application again

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because that's just an empty HTML file maybe with a loading spinner

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adding your JavaScript and your CSS in there and you're back to the plain old SPA,

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which is why you can use a framework like Nuxt to build all kinds of applications

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and you can switch that by just a few things in the config.

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Yeah, and so you have a lot of flexibility with exactly how things get rendered and run and all of that.

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How would you define the benefits of static versus server side rendering?

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Yeah, I think, as I mentioned, that you can host it everywhere.

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It's a big plus.

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You don't need the server running all the time.

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And it's the faster it gets because there's no API call.

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There's nothing.

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Nothing is faster than just plain HTML.

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Just sending the files.

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Yes, exactly.

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That's a big pro.

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Just putting in a CDN, cache it, and you're good.

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It's, of course, tricky if you need new data because then you have to rebuild the whole site usually.

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So if you have to change things every couple of minutes, then static site generation might not be for you.

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Unless also there are options to say, hey, please pre -render only these pages and then it's fine.

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So if you have landing pages and they won't necessarily change, you can pre -render them, but still have a server running for the rest.

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For my own website, I have the blog side of things all pre -rendered in that way because they don't really change.

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I occasionally update them, but then I push those changes and then the build happens again and then the whole site's rebuilt.

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But that doesn't happen that frequently.

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But then I have the other part,

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my course platform side, which is interesting because it's technically just static content.

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It's like a blog, but it has authentication around it.

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So it's harder to do statically and have that authentication.

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And so then the way that I've set it up is the blog side is pre -rendered for speed and all that.

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And then the other side, the course platform side is just SSR, just the default.

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Oh, so you use source -ed rendering with something behind authentication there.

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Yeah.

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Interesting.

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I think you could even say for that part, you turn off SSR.

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Yeah.

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Then you might lose a tiny bit of perceived performance, but then people will just be faster to login form,

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I suppose, or a bit slower to login form.

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And then you can even use that.

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Because that's also one important thing to mention.

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even

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if you do authentication on the server side everything

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that's in the front end like every component every view page you write is technically visible

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and human readable you just go through the for the javascript files

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so if your content i i mean i assume it does

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but for all the listeners as well um

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if your content doesn't come from an api people can just read it um

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and it's most important that it comes from an api

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and is secured if you don't want certain users to see it because then people really need to be logged in,

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authenticated to get actually access to that.

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Yeah, I have considered, well, yeah, to your point about the single page app thing,

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I want to do some testing with that to see if that's better or worse or what.

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There's also a way that you could have it pre -rendered,

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But then if you built a custom server to serve those pre -rendered files,

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and then that server has the authentication built in, then instead of just like giving it free access,

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then you sort of get like the best of both worlds.

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But I think that's a little more complex and I'm not really interested in going down that route at this point.

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Yeah, I also think you don't gain that much from that

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because I think the added setup would be a bit more complex for sure.

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But usually when it comes to authentication, then you have to use cookies then, right?

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Because if you need authentication during server -side rendering on the server side, no local storage.

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So there's that only way going for cookies, which is reasonable.

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But of course, you could reduce the complexity by just saying, hey, okay, it's an SPI, it's fine.

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And if people, let's say, bought access anyway, they probably don't bother with,

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I don't know, half a second more perceived loading time.

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Just like fictional number, right?

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I don't know the numbers for that, depending on the site.

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That's the way that I've thought about it too.

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Obviously, I don't want it to be slow or terrible performance in UX like that.

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Like it matters but at the same time, it's different than a blog post where someone is coming in from Google and they're like,

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you know, if it doesn't load fast, you're just like, all right, back, let's check out the next one.

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Like if you're going through a course, you're spending hours on this thing anyway.

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And so, you know, it's loaded up and you're going through it.

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I mean, ideally you bought it already.

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So that's the best part.

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Like you're not losing customers or potential customers.

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People are more like, okay, nice, I'll get in there.

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And it will already feel fast and snappy.

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So that's good.

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Let's pick up one more thing, which you already mentioned.

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You already said the word incremental.

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So of course, that's not the end of the service that's rendering, like sub modes or patterns or however you want to call it.

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Yeah, there's of course more.

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I think especially with NAX, the whole incremental static generation or incremental static regeneration,

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ISG and ISR, or incremental static revalidation, I also heard.

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Anyway, we go all down the same road.

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A lot of different terms.

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Yeah, naming things is hard, but then just stick to one, please.

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It never works, though.

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They all are ways to say, okay, I have dynamic server -side rendering.

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But in a way, I don't want to hit the server all the time.

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I have some cache in between.

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And depending on how that cache looks like, it's one or the other.

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So let's go back for a second to static site generation.

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And the problem is, of course, if we need recent data or very up -to -date things, then it's tricky.

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The other issue is if you have 100 blog pages, it's fine.

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But if you have, let's say, 100 ,000 articles or 100 ,000 items in e -commerce store, it's tricky, right?

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Because the builds would take ages and then you'd have to rebuild and so on, so on.

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So even if it's like not super real -time data, but more like I have a news website and I have 100 ,000 articles,

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which is for a bigger news website, not that uncommon.

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you can't steadily generate all of them ahead of time because

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that will take ages hours maybe even days um so

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that was one of the big problems also by the whole jam stack movement was a bit like yeah

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it's tricky and then someone came up with isg

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and isr saying okay you know what we do the same thing as with dynamic server set rendering

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so we have a server there and it's rendering stuff but why don't we cache the whole response?

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So why don't we just say like, okay, we take it, stick in the cache and when someone hits the page again,

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we'll just get that cache response.

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And that's more or less incremental static generation.

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Let's say the sites won't be generated initially.

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The first user who hit the site, yeah, they have to wait a little bit because that's the initial server -side rendering,

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which might take longer because our API calls on the server and so on and so on.

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But after that, we just get the cached version.

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So we're taking this binary choice between static or server -side rendered,

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and we're turning it into more of a spectrum where you can like...

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you could be fully static, you could be fully dynamic server side rendered, or you could be somewhere in the middle

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and sort of kind of figure out what balance works for your application and your site, your needs in that way.

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Exactly.

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And then you can even say, oh, these are like more important.

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Let's cache them not that long or these sites can be cached for a day.

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It's fine.

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And you can even go one step further and use SWR, which is another acronym for Stale Revalidate,

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basically saying, okay, for my pages, I just set up, let's give them the cached version.

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So let's say you hit slash about and slash about was never generated.

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Then you as the first user, you get the generated version.

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So it will take a little bit.

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It's fine.

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Now, if I hit the page, I get the cached version.

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But if you enable stale, very validate, it will check, okay, is this cached version too old?

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Too old meaning it should be revalidated.

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But if I say yes, for example, it is too old, it should be revalidated.

418

I still get the stale content while the server in the background will revalidate the page, meaning it will update the cache with the newest entry,

419

and then the user after me hitting the page will get the new website, and the same starts again.

420

That's a wonderful pattern if you say, oh yeah, I want to reduce the load on my server because if I set it to one second,

421

for example, I have 100 users going on the same page.

422

I don't have 100 requests to the server, but when I'm going to the server,

423

the rest may be also waiting for the cache to populate or just get the things out of the cache.

424

And then the server will repopulate the whole thing once and you're good.

425

And it's an interesting way of balancing performance for the end user

426

and serving them the content as fast as possible while still updating the content and regenerating it as needed.

427

it is kind of like tricky to think about because it's like, wait, every, as a user, if you hit the endpoint,

428

you're, unless you're the very first one, you're never getting like the most recently generated one.

429

You're always getting the cached version, which might be, you know, as you had pointed out, it might be still valid,

430

but it might also be like the old, the old one.

431

And then the next person gets the updated version.

432

But it's kind of interesting to think about because then it sort of,

433

it means that the routes on your app that are the most popular get updated more frequently.

434

And the ones that no one goes to don't really get updated at all.

435

And so it makes sense from that sense.

436

That's good and bad as well, right? then like, oh yeah, somebody might go to a page and get like super old content.

437

You can even fix that by saying, oh yeah, if the cache entry is older than an hour a day or whatever,

438

then just do whatever the first user did with like your full service rendering request.

439

Then the user might have to wait a bit, but gets the most recent thing.

440

Right.

441

So there's ways to catch that so you don't get like really old content.

442

Yeah.

443

Yeah, you can basically say, okay, when should it be revalidated in background?

444

When should the cache entry be thrown away?

445

Like these are the two like maximum ages you can define.

446

So there's a lot of stuff with server -side rendering.

447

It's a very complex, in -depth topic.

448

And I think we've covered quite a bit of stuff here.

449

There's certainly a lot of ways to optimize and to configure for your specific needs and for whatever,

450

like literally whatever kind of app you are running,

451

whether it's like a basic marketing page or a giant news site or a SaaS app or whatever,

452

whatever else you're building.

453

yeah what as long as it's public facing

454

you might need ssr at least for a tiny part of application that's true

455

and i mean there i guess there are a few more things

456

that we could cover

457

but might be good for another episode like next server components could be could be very interesting to go into

458

that a bit more in depth um also islands architecture

459

and astro something that's really interesting and getting a lot of traction is loved throughout the whole like ecosystem them.

460

But yeah, I also think now everybody should have a little bit of a better understanding with regards to server -side rendering.

461

And if there are any questions left, then as usual, shoot us a message on some kind of social media, wherever you can find us.

462

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Vocabolario e note di pronuncia per questa lezione

Questa lezione di conversazione si basa sul video “DejaVue - The Need for Server-Side Rendering”. Le parole che ritornano più spesso: server, page, rendering. Questo video contiene 466 frasi e 5783 parole da ripetere con lo shadowing. Il parlato dura 35:44. Chi parla ha un ritmo naturale di circa 162 parole al minuto, vicino a una conversazione quotidiana. Il 85% delle parole rientra nelle 3.000 più comuni dell’inglese; conviene studiare le altre prima di iniziare.

Vocaboli chiave di questo video

15 parole del video che vale la pena imparare, con pronuncia e significato:

Parola	Pronuncia	Significato
server sostantivo	/ˈsɝvɚ/	server
render verbo	/ˈɹɛn.dɚ/	rendere
cache sostantivo	/kæʃ/	nascondiglio, ripostiglio
static aggettivo	/ˈstæt.ɪk/	statico
generate verbo	/ˈd͡ʒɛn.ə.ɹeɪt/	generare
tricky aggettivo	/ˈtɹɪk.i/	insidioso, ingannevole
component sostantivo	/kəmˈpoʊ.nənt/	componente
dynamic aggettivo	/daɪˈnæm.ɪk/	dinamico
framework sostantivo	/ˈfɹeɪm.wɜːk/	struttura portante
complexity sostantivo	/kəmˈplɛk.sɪ.ti/	complessità
ideally avverbio	/aɪˈdi.ə.li/	idealmente, preferibilmente
solve verbo	/sɒlv/	risolvere
perceive verbo	/pɚˈsiv/	percepire
listener sostantivo	/ˈlɪs(ə)nɚ/	ascoltatore, ascoltatrice
plain sostantivo	/pleɪn/	pianura

I phrasal verb che sentirai

Parola	Significato
go through verbo	attraversare
turn off verbo	spegnere
build up verbo	accumulare
check out verbo	investigare
come across verbo	dare l'impressione, avere l'aria
come up verbo	venire fuori, emergere
come up with verbo	ideare, escogitare
figure out verbo	scoprire, rendersi conto

Frasi da ripetere

Frasi brevi e complete del video che puoi riutilizzare nella conversazione di tutti i giorni:

You just don't know it yet.
Do you need it?
Why would you use it?
Let's render everything on the server.
You don't have control over the network speed.

La grammatica di questo video

Le strutture che chi parla usa di più, con le parole esatte del video:

Struttura	Nel video
Forma passiva be + participio passato — conta ciò che accade, non chi lo fa	were born · is rendered · is needed
Present perfect have/has + participio passato — un’azione passata che conta ancora adesso	we've gotten · has been · I've found
Frasi relative who / which + frase — un’informazione in più su una persona o una cosa	Rails, which is · paint, which is · Vibe, which was

Pronuncia a cui fare attenzione

Chi parla usa 104 contrazioni e forme ridotte, come don't, you're, I'm. Pronunciale nella forma breve, così come le senti.

I suoni “th”: bother /ˈbɑðɚ/, aesthetic /ɛsˈθɛ.tɪk/, authentication /ɔːˌθɛntɪˈkeɪʃn̩/
I suoni “sh” e “zh”: cache /kæʃ/, representation /ˌɹɛp.ɹə.zɛnˈteɪ.ʃən/, occasionally /əˈkeɪʒənəli/, interaction /ˌɪn.təˈɹæk.ʃən/, reception /ɹɪˈsɛp.ʃn̩/
Parole lunghe — attenzione all’accento: complexity /kəmˈplɛk.sɪ.ti/, ideally /aɪˈdi.ə.li/, architecture /ˈɑː.kɪˌtɛk.t͡ʃə/, representation /ˌɹɛp.ɹə.zɛnˈteɪ.ʃən/, technically /ˈtɛk.nɪˌkəl.i/

I suoni difficili per chi parla italiano:

/h/ — va soffiata, non è muta: helpful /ˈhɛlp.fl̩/, hybrid /ˈhaɪ.bɹɪd/, whereas /(h)wɛɹˈæz/, hook /hʊk/, wherever /(h)wɛɹˈɛvɚ/
Consonante finale — senza aggiungere una vocale dopo: cache /kæʃ/, static /ˈstæt.ɪk/, generate /ˈd͡ʒɛn.ə.ɹeɪt/, component /kəmˈpoʊ.nənt/, dynamic /daɪˈnæm.ɪk/
/æ/ — più aperta della “e”: cache /kæʃ/, static /ˈstæt.ɪk/, dynamic /daɪˈnæm.ɪk/, admin /ˈædˌmɪn/, podcast /ˈpɑdˌkæst/

Come esercitarsi con questo video

Ascolta tutto il video una volta senza parlare e annota le parole che non conosci.
Inizia a velocità 0,75×, fai shadowing frase per frase e torna alla velocità normale quando diventa facile.
Registrati e confronta con l’originale, facendo attenzione a parole come server, render, cache.

Cos'è la tecnica dello Shadowing?

Shadowing è una tecnica di apprendimento delle lingue supportata da studi scientifici, originariamente sviluppata per la formazione dei traduttori professionisti e resa popolare dal poliglotta Dr. Alexander Arguelles. Il metodo è semplice ma potente: ascolti un audio in inglese di madrelingua e lo ripeti immediatamente ad alta voce — come un'ombra che segue il parlante con un ritardo di solo 1–2 secondi. A differenza dell'ascolto passivo o degli esercizi di grammatica, lo shadowing costringe il tuo cervello e i muscoli della bocca a elaborare e riprodurre simultaneamente i modelli di discorso reale. La ricerca dimostra che migliora significativamente la precisione della pronuncia, l'intonazione, il ritmo, il discorso connesso, la comprensione dell'ascolto e la fluidità del parlato — rendendolo uno dei metodi più efficaci per la preparazione alla prova di speaking dell'IELTS e per la comunicazione reale in inglese.

Tecnica dello shadowing: leggi la guida completa passo dopo passo →

Pratica di Shadowing: DejaVue #E001 - The Need for Server-Side Rendering (SSR) - Impara a parlare inglese con i video

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Vocabolario e note di pronuncia per questa lezione

Vocaboli chiave di questo video

I phrasal verb che sentirai

Frasi da ripetere

La grammatica di questo video

Pronuncia a cui fare attenzione

Come esercitarsi con questo video

Cos'è la tecnica dello Shadowing?