async scripts, defer scripts, module scripts: explainer, comparison, and gotchasYou signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. Reload to refresh your session. You switched accounts on another tab or window. Reload to refresh your session. Dismiss alert
Normative: Reduce the number of ticks in async/await by MayaLekova · Pull Request #1250 · tc39/ecma262
JavaScript programmers may expect that the following two programs are largely similar in terms of how they perform with respect to the ECMAScript job queue (if inside of an async function): promise.then(f); f(await promise); However, if promise is a built-in promise, then these two code fragments will differ in the number of iterations through the job queue are taken: because await always wraps a
Asynchronous stack traces: why await beats Promise#then() · Mathias Bynens
Compared to using promises directly, not only can async and await make code more readable for developers — they enable some interesting optimizations in JavaScript engines, too! This write-up is about one such optimization involving stack traces for asynchronous code. The fundamental difference between await and vanilla promises is that await X() suspends execution of the current function, while p
Prefer DEFER Over ASYNC
Steve works at SpeedCurve on the interplay between performance and design. He previously served as Google's Head Performance Engineer, Chief Performance Yahoo!, and Chief Performance Officer at Fastly. Steve has pioneered much of the work in the world of web performance. He is the author of High Performance Web Sites and Even Faster Web Sites. He is the creator of many performance tools and servic
New JavaScript techniques for rapid page loads
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Script-injected "async scripts" considered harmful - igvita.com
By Ilya Grigorik on May 20, 2014 Synchronous scripts are bad because they force the browser to block DOM construction, fetch the script, and execute it before the browser can continue processing the rest of the page. This, of course, should not be news, and is the reason why we have been evangelizing the use of asynchronous scripts. Here is the canonical example: <!-- BAD: blocking external script
Thinking Async | CSS-Tricks
Here’s the rub: when you load JavaScript from a third party you should do it asynchronously. You might want to load your own scripts asynchronously too, but for this article let’s focus on third parties. There are two reasons for this: If the third-party goes down or is slow, your page won’t be held up trying to load that resource. It can speed up page loads. At Wufoo, we just switched over to an
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GitHub - YuzuJS/setImmediate: A cross-browser implementation of the new setImmediate API.