1371641 - YouTube navigation start profile

Status: RESOLVED INACTIVE

(Core :: Performance, defect)

Description

[Filip Andrei]

Steps to reproduce:
1. Launch browser..
2. Record with Gecko Profile:
3. Fill Youtube.com in Navigation Start, then press enter. 
4. Share the profile


Gecko profile:
https://perfht.ml/2r1Eugv

Comment 1

[Zibi Braniecki [:zbraniecki][:gandalf]]

This is my first profile analysis, so take it with a grain of salt.

The first outlier I noticed in the profile is that it seems to take ~250ms to paint:

 * 251ms | 32.9% | PresShell::Paint https://www.youtube.com/
 ** 110ms | | BasicPaintedLayer::PaintThebes
 *** 27ms | | GlyphLookupCache::TryGetCachedGlyphLayout<GlyphLookupCache::BitmapTraits>(ClientSideCacheContext &,FontFace const &,LookupCacheBitmapEntry &,unsigned short)

 * 84ms | 11.0% | NtWaitForMultipleObjects
 * 34ms | 4.5%  | PresShell::Paint https://www.youtube.com/

:freesamael suggested NI'ing :mattwoodrow for the Paint question - there seems to be two paints, one takes 250ms, the other takes 34ms.

Comment 2

[Bobby Chien]

Jeff, could you also help to follow Zibi's investigation? Thanks.

Comment 3

[Bobby Chien]

Filip, since the profile was out of date, could we provide new profile based on Nightly 57? Thanks.

Comment 4

[Ionut Budeanu]

You can find the new profile below.

This Profile was recorded with the Acer hardware

Name: Firefox
Version: 57.0a1
Windows 10 64 bit
buildID: 20170810100255

Steps to reproduce:

1. Launch browser.
2. Record with Gecko Profile:
3. Fill Youtube.com in Navigation Start, then press enter. 
4. Share the profile




Gecko profile: https://perfht.ml/2fxNY2g

Comment 5

[Bobby Chien]

Zibi, could you help have another analysis per comment 4 again? Thanks.

Comment 6

[Zibi Braniecki [:zbraniecki][:gandalf]]

Sorry, can't help here.

Comment 7

[BugBot [:suhaib / :marco/ :calixte]]

The bug assignee didn't login in Bugzilla in the last 7 months, so the assignee is being reset.

Comment 8

[Andrew McCreight [:mccr8]]

I'm assuming a perf bug this old can probably be closed, but I'll move it and leave it open for now.