1723148 - Other Firefox windows slowdown when playing Youtube video.

Status: RESOLVED DUPLICATE of bug 1720634

(Core :: Graphics: WebRender, defect)

Description

[mike.liu.dev]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:90.0) Gecko/20100101 Firefox/90.0

Steps to reproduce:

                   -`                    foo@servalWS
                  .o+`                   -------------
                 `ooo/                   OS: Arch Linux x86_64
                `+oooo:                  Host: Serval WS serw11-b
               `+oooooo:                 Kernel: 5.13.5-arch1-1
               -+oooooo+:                Uptime: 1 hour, 56 mins
             `/:-:++oooo+:               Packages: 1041 (pacman)
            `/++++/+++++++:              Shell: fish 3.3.1
           `/++++++++++++++:             Resolution: 3840x2160, 3840x2160
          `/+++ooooooooooooo/`           WM: i3
         ./ooosssso++osssssso+`          Theme: Nordic-darker [GTK2/3]
        .oossssso-````/ossssss+`         Icons: Flat-Remix-Grey-Dark [GTK2/3]
       -osssssso.      :ssssssso.        Terminal: tmux
      :osssssss/        osssso+++.       CPU: Intel i9-9900K (16) @ 5.000GHz
     /ossssssss/        +ssssooo/-       GPU: NVIDIA GeForce RTX 2060 Mobile
   `/ossssso+/:-        -:/+osssso+-     Memory: 5949MiB / 15817MiB
  `+sso+:-`                 `.-/+oso:
 `++:.                           `-/+/
 .`                                 `/

With Webrender enabled:

1. Have at least 2 windows of Firefox open
2. Go to https://www.testufo.com/ in one window and note full FPS.
3. Play Youtube video in the other window.
4. First window with UFO test will show half FPS.

There is a noticeable difference when scrolling through static websites as well.

Actual results:

Half FPS shown in other window not playing Youtube video.

Expected results:

No slowdown of rendering in the other Firefox window.

Comment 1

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

The Bugbug bot thinks this bug should belong to the 'Core::Graphics: WebRender' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.