Open Bug 1943813 Opened 18 days ago Updated 16 days ago

Testcase from Bug 1814711 takes 1.25x times more time on Nightly

Categories

(Core :: JavaScript Engine, task, P3)

task

Tracking

()

People

(Reporter: mayankleoboy1, Unassigned)

References

Details

Open the attached testcase from Bug 1814711 (https://bugzilla.mozilla.org/attachment.cgi?id=9379494)

Nightly: https://share.firefox.dev/42N0Asb (2850ms without the profiler)
Chrome: https://share.firefox.dev/3PX3C57 (2280ms without the profiler)

From bug 1814711 it sounds like performance in this testcase was important. Not sure how important it is now.
As usual, feel free to WONTFIX.

The numbers I get today are similar to the ones in bug 1814711 comment 8 for Nightly and Safari, but Chrome is around 1900-2000 ms now so they've optimized Object.assign since then.

This probably needs some sort of assign cache because it will be hard to make the current fast path for plain objects a lot faster.

Severity: -- → S3
Priority: -- → P3
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