Closed Bug 1337482 Opened 8 years ago Closed 8 years ago

ES6 implementation much slower than ES5 for some features

Categories

(Core :: JavaScript Engine, defect)

defect
Not set
normal

Tracking

()

RESOLVED DUPLICATE of bug 1307395

People

(Reporter: alex.fdm, Unassigned)

References

()

Details

The ES6 implementation of some features is much slower than the ES5 equivalents according to this test: 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 just ~1.2x slower.

This should probably be turned into a metabug, with specific issues as dependencies.
Thanks for your report. We are aware of these performance and hope to find time to fix them soon.
Status: NEW → RESOLVED
Closed: 8 years ago
Resolution: --- → DUPLICATE
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