Open
Bug 1939096
Opened 2 months ago
Updated 1 month ago
Modified Codepen demo (https://codepen.io/Nilali/pen/VBZZYX ) is 5x-6x slower in Nightly
Categories
(Core :: JavaScript Engine, task, P3)
Core
JavaScript Engine
Tracking
()
NEW
People
(Reporter: mayankleoboy1, Unassigned)
References
(Blocks 1 open bug, )
Details
Attachments
(1 file)
3.43 KB,
text/html
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Details |
Open the attached testcase.
Chrome: https://share.firefox.dev/3PdfFLC (900ms)
Nightly: https://share.firefox.dev/3BLAZV8 (8s)
The demo is variable in nature, so the timings will be different each time you run it. But in general, Nightly is slower.
Comment 1•1 month ago
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Looks like we're spending almost all our time in this code:
for (x=1; x<w-1; x+=2) {
for (y=1; y<h-1; y+=2) {
if (m[y][x]==='#') d=0;
}
}
In particular, I think m[y][x]
is the hotspot. This is another case where our array lookup seems slower than V8. Being this much slower is a bit surprising.
Severity: -- → S3
Priority: -- → P3
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Description
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