Open Bug 1307395 (es6perf) Opened 5 years ago Updated 4 months ago
[meta] Optimize ECMAScript 6 performance
We should optimize ES6 to make sure users don't get worse performance when using new language features.
There's a benchmark that compares the performance of ES6 features with the equivalent ES5 implementation: https://fhinkel.github.io/six-speed/ On most of the tests where Firefox ES6 is slower, it is way worse than other browsers. For example in the "classes" tests Firefox is ~30x slower, but Chrome is ~2x slower and Edge is only ~1.2x slower.
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