Open
Bug 1909083
Opened 3 months ago
Updated 2 months ago
JS demo (https://www.fxhash.xyz/generative/slug/fit ) is more 2x slower in Nightly
Categories
(Core :: JavaScript Engine, defect, P3)
Core
JavaScript Engine
Tracking
()
NEW
People
(Reporter: mayankleoboy1, Unassigned)
References
(Blocks 4 open bugs, )
Details
Go to https://www.fxhash.xyz/generative/slug/fit
Nightly: https://share.firefox.dev/4d4Wddy (3.5s)
Chrome: https://share.firefox.dev/4fd8jmT (1.6s)
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Comment 1•3 months ago
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In that profile, almost all of our time is spent in Ion JIT code.
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Comment 2•3 months ago
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This sounds like this could be an inlining decision issue.
Maybe iain might want to have a look at the Mr function and our inlining decisions of the T function?
Severity: -- → S4
Type: task → defect
Flags: needinfo?(iireland)
Priority: -- → P3
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Reporter | |
Comment 3•3 months ago
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(adding back bug 1808325 as blocking just for ease of my reference)
Blocks: sm-codepen-slower
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Comment 4•3 months ago
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It looks like we're making different inlining decisions. I'm not entirely certain that the inlining decisions are the cause of the performance difference, but I'll add it to my list of bugs to look at if/when we revisit inlining heuristics.
Flags: needinfo?(iireland)
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Description
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