Open Bug 1769880 Opened 2 years ago Updated 1 year ago

https://scratch.mit.edu/projects/196070469/ runs around twice as slow in Firefox vs Chrome

Categories

(Core :: JavaScript Engine: JIT, defect, P3)

defect

Tracking

()

People

(Reporter: jrmuizel, Unassigned)

References

(Blocks 2 open bugs)

Details

90ms vs 45ms

Most of the time is spent in Ion jitted code.

http://llk.github.io/scratch-vm/#119615668 seems to show a similar performance difference

Profiled http://llk.github.io/scratch-vm/#196070469, producing this profile https://share.firefox.dev/3sUnPh0

Looks like a solid 30% of the execution time is spent in js::AtomizeString

Severity: -- → S3
Priority: -- → P3

Latest Profile: https://share.firefox.dev/3HMupxV
Visually, we are still quite slow compared to Chrome.

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