Closed Bug 1881910 Opened 2 years ago Closed 2 years ago

Nightly is 2.5x slower than Chrome on an online text comparator

Categories

(Core :: JavaScript Engine, task)

Product:
Core
Component:
JavaScript Engine
Type:
task

Tracking

()

Status:
RESOLVED DUPLICATE of bug 1881911

People

(Reporter: mayankleoboy1, Unassigned)

References

(
URL
)

Details

Go to https://www.textcompare.org/
From the attached text files, select the "original" and the "modified" files
Click on compare. Make sure that the type of comparison is for Plaintext.

Chrome: https://share.firefox.dev/4bSQ44H (6s)
Nightly: https://share.firefox.dev/3IcghNL (14s)

Status: NEW → RESOLVED
Closed: 2 years ago
Duplicate of bug: 1881911
Resolution: --- → DUPLICATE
No longer blocks: sm-codepen-slower

Glancing at the profile, V8 is spending 93% of the time in compute, while we're only spending 32%. However, all the other hot functions are being called directly from compute. Collapsing the subtree underneath compute gives 95% for us. I think this implies that V8 is inlining more aggressively than we are, in which case maybe they can do a better job of optimizing the code post-inlining.

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