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React 19 will warn when using the old JSX transform (incl. dependencies). If you're still using it - consider upgrading, you'll also get some perf benefit for free: github.com/facebook/react… see legacy.reactjs.org/blog/2020/09/2… + PR: github.com/facebook/react…

Meet UNO, the missing link in any TTFB analysis. Without Unattributed Navigation Overhead you are lost, because TTFB is rarely the sum of Redirect+DNS+TCP+TLS in the field! Understanding UNO has saved me countless hours in RUM. #webperf #ttfb blog.akamai-mpulse.com/blog/2024-02-2…

Sunday rant. For software engineering, my sense is that the phrase “premature optimization is the root of all evil” has massively backfired. Its from a book on data structures and mainly tried to dissuade people from prematurely write things in assembler. But the point was to

This month, at Framer, we've shipped an idea I came up with that moves expensive Lambda executions to the background to avoid slow TTFB, without any queue system. The trick? A combination of cache-control HTTP header values. Ivan has the details. Pretty cool tbh 👇🏼

In Chrome DevTools you can now find memory issues more easily. We added new filters to "Memory" to find duplicate strings, objects retained by detached DOM nodes and other reasons when taking heap snapshots.

Turns out people have slow internet in real-life and not only simulated through DevTools. Everyone act surprised! Really great article of a real life scenario, where slow internet was inevitable and how you can engineer for such cases.

It absolutely blows my mind that improvements to sort algorithms can still lead to massive improvements. github.com/rust-lang/rust…

We're excited to share e18e! Ecosystem Performance is a community initiative to bring together people who are passionate about improving performance in the JavaScript ecosystem. A space for knowledge sharing, contributions, and ideas. Get involved! 🙌 e18e.dev/blog/e18e

New web bundler just dropped. Announced last year: x.com/boshen_c/statu…

Google Sheets replaced JavaScript with Java - kind of. They compile Java to WasmGC to achieve a 2x speed up. Crazy case-study by Thomas Steiner 🤯 web.dev/case-studies/g…

Blink: Intent to Ship: scheduler.yield() groups.google.com/a/chromium.org…

scheduler.yield ships in Chromium M129 (available in the next beta release): groups.google.com/a/chromium.org… 🎉

Blink: Intent to Ship: Compression dictionary transport with Shared Brotli and Shared Zstandard groups.google.com/a/chromium.org…

Landed a set of Node.js APIs that aim to be a built-in alternative to v8-compile-cache & v8-compile-cache-lib with better performance and ESM support. github.com/nodejs/node/pu… Some early testing by Jake Bailey showed that it can make tsc load ~2.3x faster 🚀

Framer is the only *platform* out there that can automatically do this right on publish. No single visitor will download unnecessary images, and no single visitor will experience a lazy-loaded LCP image. Ivan has the details.

📢 New post: The State of ES5 on the Web. For years, we defaulted to transpiling to ES5 in order to support IE. But is that still necessary? I took a look at the data to find out, and I'll just say that the results were *actually* quite surprising! 🙀 philipwalton.com/articles/the-s…

When doing a Chrome DevTools performance trace in Chrome Canary, it will now give you additional details for animations: 1. The animation name 2. The associated DOM node 3. Whether the animation could be composited or not and specifically why that is the case Very exciting 🤩