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Nalezeno "Q4 performance": 750

A Deep Dive into Native Lazy-Loading for Images and Frames

15.5.2019
Today's websites are packed with heavy media assets like images and videos. Images make up around 50% of an average website's traffic. Many of them, however, are never shown to a user because they're placed way below the fold. What’s this thing about images being lazy, you ask? Lazy-loading...

Google Fonts is Adding font-display

14.5.2019
Google announced at I/O that their font service will now support the font-display property which resolves a number of web performance issues. If you're hearing cries of joy, that's probably Chris as he punches the air in celebration. … Read article The post Google Fonts is Adding...

Crypto Heresy: Question Blockstream on Twitter and You’ll Be Blocked

10.5.2019
Crypto Twitter (CT) is a grueling battleground between digital currency enthusiasts, company executives, maximalists, journalists, lawyers, and so-called thought leaders and luminaries. For instance, on May 8, reporter Larry Cermak posted data concerning Blockstream and its sidechain project...

Preload, prefetch and other link tags

24.4.2019
Ivan Akulov has collected a whole bunch of information and know-how on making things load a bit more quickly with preload and prefetch. That's great in and of itself, but he also points to something new to me – the as attribute: <link rel="preload" href="/style.css" as="style"...

The Serif Tax

9.4.2019
Fonts are vector. Vector art with more points makes for larger files than vector art with fewer points. Custom fonts are downloaded. So, fonts with less points in their vector art are smaller. That's the theory anyway. Shall we see if there is any merit to it? Open Sans (top) and Garamond...

Native Lazy Loading

9.4.2019
IntersectionObserver has made lazy loading a lot easier and more efficient than it used to be, but to do it really right you still gotta remove the src and such, which is cumbersome. It's definitely not as easy as: <img src="celebration.jpg" loading="lazy" alt="..." /> Addy Osmani says...

Responsible JavaScript

3.4.2019
We just made a note about this article by Jeremy Wagner in our newsletter but it’s so good that I think it’s worth linking to again as Jeremy writes about how our obsession with JavaScript can lead to accessibility and performance issues: What we tend to forget is that the environment websites...

Who has the fastest website in F1?

2.4.2019
Jake Archibald looks at the websites of Formula One race teams and rates their performance, carefully examining their images and digging into the waterfall of assets for each site: Trying to use a site while on poor connectivity is massively frustrating, so anything sites can do to make it less...

Chrome Lite Pages

19.3.2019
The Chrome team announced a new feature called Lite Pages that can be activated by flipping on the Data Saver option on an Android device: Chrome on Android’s Data Saver feature helps by automatically optimizing web pages to make them load faster. When users are facing network or data constraints...

Planning for Responsive Images

13.3.2019
The first time I made an image responsive, it was as simple as coding these four lines: img { max-width: 100%; height auto; /* default */ } Though that worked for me as a developer, it wasn’t the best for the audience. What happens if the the image in the src attribute is heavy? On high-end...

Application Holotypes

13.3.2019
It's entirely too common to make broad-sweeping statements about all websites. Jason Miller: We often make generalizations about applications we see in the wild, both anecdotal and statistical: "Single-Page Applications are slower than multipage" or "apps with low TTI loaded fast". However,...

Styling Based on Scroll Position

7.3.2019
Rik Schennink documents a system for being able to write CSS selectors that style a page when it has scrolled to a certain point. If you're like me, you're already on the lookout for document.addEventListener('scroll' ... and being terrified about performance. Rik gets to that right away by both...

Using React Loadable for Code Splitting by Components and Routes

7.3.2019
In a bid to have web applications serve needs for different types of users, it’s likely that more code is required than it would be for one type of user so the app can handle and adapt to different scenarios and use cases, which lead to new features and functionalities. When this happens, it’s...

The Client/Server Rendering Spectrum

6.3.2019
I've definitely been guilty of thinking about rendering on the web as a two-horse race. There is Server-Side Rendering (SSR, like this WordPress site is doing) and Client-Side Rendering (CSR, like a typical React app). Both are full of advantages and disadvantages. But, of course, the conversation...

The Bottleneck of the Web

5.3.2019
Steve Souders, "JavaScript Dominates Browser CPU": Ten years ago the network was the main bottleneck. Today, the main bottleneck is JavaScript. The amount of JavaScript on pages is growing rapidly (nearly 5x in the last 7 years). In order to keep pages rendering and feeling fast, we need to focus...

A Bit of Performance

28.2.2019
Here’s a great post by Roman Komarov on what he learned by improving the performance of his personal website. There’s a couple of neat things he does to tackle font loading in particular, such as adding the <link rel="preload"> tags for fonts. This will encourage those font files...

instant.page

18.2.2019
instant.page is a pretty cool project from Alexandre Dieulot. Alexandre has been at this idea for half a decade now, as InstantClick is his and is essentially the same exact idea. The idea is that there is a significant delay between hovering over a link and clicking that link. Say it takes...

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