1019560 - Huge FPS drop and increase in CPU usage when selecting the "Large Player" in YouTube when E10S is enabled

Status: RESOLVED INVALID

(External Software Affecting Firefox Graveyard :: Flash (Adobe), defect)

Description

[Achwaq Khalid]

User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:32.0) Gecko/20100101 Firefox/32.0 (Beta/Release)
Build ID: 20140602072051

Steps to reproduce:

Enable e10s in the latest Nightly
Go to: www.YouTube.com
select a video
switch to "Large Player"


Actual results:

FPS Drop
Increase in CPU Usage in the following processes:
- plugin-container
- firefox
- flash player plugin


Expected results:

smooth playing experience

Comment 1

[Jim Mathies [:jimm]]

We don't have support for windowed mode yet. Marking dependent on that work.

Comment 2

[John Schoenick [:johns]]

If you set |plugins.force.wmode| to transparent in a non-e10s build, do you see similar behavior? If so this is just a side effect of flash windowless mode not being very efficient.

If it *doesn't* repro outside e10s mode with that pref, though, it could mean our plugin layers code needs to be looked at for windowless, which is probably independent of the windowed-mode/IPC work

Comment 3

[Jim Mathies [:jimm]]

Note, I'm not seeing a big improvement in perf with windowed plugins either. This may be more internal vs. something related to windowless.

Comment 4

[Jim Mathies [:jimm]]

I'm marking this invalid simply because I can't find flash on youtube anymore. Please reopen if you can reproduce on another flash based video site.