Published: September 30, 2022, Last updated: December 19, 2024 Common advice for keeping JavaScript apps fast tends to boil down to the following advice: "Don't block the main thread." "Break up your long tasks." This is great advice, but what work does it involve? Shipping less JavaScript is good, but does that automatically equate to more responsive user interfaces? Maybe, but maybe not. To unde
Don't let render-blocking resources block you on the road to good performance. Photo by Tim Wilson on Unsplash You might be here because Lighthouse told you to "eliminate render-blocking resources". Render-blocking resources are a common hurdle to rendering your page faster. They impact your Web Vitals which now impact your SEO. Slow render times also frustrate your users and can cause them to aba
There is no faster (pun intended) way to slow down a site than to use a bunch of JavaScript. The thing about JavaScript is you end up paying a performance tax no less than four times: The cost of downloading the file on the network The cost of parsing and compiling the uncompressed file once downloaded The cost of executing the JavaScript The memory cost The combination is very expensive. And we a
Toggle dark mode No, not really. (It depends.) What does “slow” mean? I said it before, and I will say it again: If you didn’t measure it, it is not slow, and even if you measure it, the numbers are meaningless without context. That being said, the fact that people will not even consider adopting Web Workers because of their concerns about the performance of postMessage(), means that this is worth
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February 18, 2019 How browsers schedule and execute scripts can impact the performance of web pages. While techniques like <script defer>, <link rel=preload> (and others) influence script loading, knowing how browsers interpret them can also be helpful. Thanks to Kouhei Ueno, we now have an up to date summary of script scheduling in Chrome.
One of the core decisions web developers must make is where to implement logic and rendering in their application. This can be difficult because there are so many ways to build a website. Our understanding of this space is informed by our work in Chrome talking to large sites over the past few years. Broadly speaking, we encourage developers to consider server-side rendering or static rendering ov
27 October, 2018 The Three Types of Performance Testing Written by Harry Roberts on CSS Wizardry. Table of Contents Proactive Reactive Passive What This Means for Developers What This Means for the Business A lot of companies—even if they are aware that performance is key to their business—are often unsure of how, when, or where performance testing sits within their development lifecycle. To make
Published: October 8, 2021 If you've used connection throttling in the network panel in a browser's developer tools (or Lighthouse in Chrome) to assess loading performance, you know how convenient those tools are for performance tuning. You can quickly measure the impact of performance optimizations with a consistent and stable baseline connection speed. The only problem is that this is synthetic
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