# How Firefox Boosted Its JavaScript Performance **URL:** \ **Category:** News & Articles\ **Tags:** programming, browsers\ **Created:** [November 23, 2020, 12:18pm UTC](https://onehack.st/t/how-firefox-boosted-its-javascript-performance/163563 "2020-11-23T12:18:10Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![TheStrength](https://onehack.st/user_avatar/onehack.st/thestrength/32/46753_2.png) [@TheStrength](https://onehack.st/u/TheStrength)\ **Post date:** [November 23, 2020, 12:18pm UTC](https://onehack.st/t/how-firefox-boosted-its-javascript-performance/163563/1 "2020-11-23T12:18:10Z")
![speed-164063_12801-100689806-large](https://onehack.st/uploads/default/original/3X/6/f/6f48e6589e3e88fe5d737902a4ad9a5ac2f9d287.jpeg) InfoWorld reports:_Firefox users [can expect improved JavaScript performance](https://www.infoworld.com/article/3597300/mozilla-firefox-boosts-javascript-performance.html) in the [Firefox 83](https://news.slashdot.org/story/20/11/17/1725230/firefox-83-arrives-with-https-only-mode-and-faster-performance) browser, with the Warp update to the [SpiderMonkey JavaScript engine](https://www.infoworld.com/article/3561477/mozilla-revamps-regexp-support-in-spidermonkey-javascript-engine.html) enabled by default._ Also called WarpBuilder, Warp improves responsiveness and memory usage and speeds up page loads by making changes to JiT (just-in-time) compilers… Warp has been shown to be faster than Ion, SpiderMonkey’s previous optimizing JiT, including a 20 percent improvement on Google Docs load time. Other JavaScript-intensive websites such as Netflix and Reddit also have shown improvement… _Warp has replaced the front end — the MIR building phase — of the IonMonkey JiT… Mozilla also will [continue to incrementally optimize the back end of the IonMonkey JiT](https://hacks.mozilla.org/2020/11/warp-improved-js-performance-in-firefox-83/), as Mozilla believes there is still room for improvement for JavaScript-intensive workloads._