Bug 248602

Summary:	Slow performance than other browsers in IE Test Drive PopCorn Benchmark
Product:	WebKit	Reporter:	Ahmad Saleem <ahmad.saleem792>
Component:	New Bugs	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	ap, cdumez, eric.carlson, jer.noble, simon.fraser, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	Safari Technology Preview
Hardware:	Unspecified
OS:	Unspecified

Description Ahmad Saleem 2022-12-01 07:22:59 PST

Hi Team,

While just doing bit synthetic benchmark testings, I came across following:

Benchmark - https://testdrive-archive.azurewebsites.net/Performance/Popcorn/Default.html

Safari 16.1 (stutters visually and audio as well) - 8.11 seconds
Safari Technology Preview 159 (stutters visually and audio as well) - 7.17 seconds (6.66 in Private Mode) [I do have AdGuard installed]
Chrome Canary 110 - 1.79 seconds (no stutter)
Firefox Nightly 109 - 1.33 seconds (no stutter).

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MacBook Pro 14 inch - M1 Pro - 16 GB - Baseline

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I think we should investigate both audio stutter and slow performance as well.

Thanks!

Comment 1 Ahmad Saleem 2022-12-01 07:31:13 PST

NOTE - I selected "large" popcorn size.

Comment 2 Alexey Proskuryakov 2022-12-01 09:04:35 PST

I cannot reproduce that much of a difference with newer macOS/Safari on an Intel MacBook Pro, FWIW: Safari was 3.5 seconds, and Chrome was 2.5 seconds.

Looks like most time is spent in PlatformMediaSessionManager::maybeActivateAudioSession().

Comment 3 Alexey Proskuryakov 2022-12-01 09:07:38 PST

That was with default (medium) size. With large, I'm getting 9 seconds in Safari, and 3.5 in Chrome.

Comment 4 Radar WebKit Bug Importer 2022-12-01 13:25:04 PST

<rdar://problem/102874433>