1954307 - www.bankonloop.com eats 300% CPU on rasterization with HW Webrender

Status: UNCONFIRMED

(Core :: Graphics: WebRender, defect)

Description

[Jeff Fortin]

Attachment: Screenshot of CPU usage.png

Steps to reproduce

Testing with Fedora 41's Firefox 136 package running on the Wayland GNOME 47.4 session on a Linux desktop with open source Mesa 25.0 "radeonsi" graphics:

1. Visit https://www.bankonloop.com (with its "Bank on Loop to [variable text part]" animated header)
2. Observe CPU usage

Actual results

Simply letting Firefox idle in front of that page eats 80% of my CPU (Intel Xeon W3520 × 8).

Expected results

In comparison:

• Chromium 133 "only" eats 15 to 35% CPU on that same page.
• Epiphany (GNOME Web) "canary" (WebKitGTK 2.47.4 git) "only" eats 30 to 40% of my CPU on that page.

Comment 1

[Jeff Fortin]

Regular "Firefox" profile: https://share.firefox.dev/4ibhV2E

Comment 2

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

The Bugbug bot thinks this bug should belong to the 'Core::Widget: Gtk' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 3

[Martin Stránský [:stransky] (ni? me)]

That site does lot of 2d rasterization. There are 8 WRWorkerLP# processes which runs skia operations and that eats the CPU:
https://share.firefox.dev/4c6mARq

Comment 4

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

The severity field is not set for this bug.
:gw, could you have a look please?

For more information, please visit BugBot documentation.

Comment 5

[Jeff Fortin]

Attachment: Sample - saved snapshot of the website front page (complete page)

That website doesn't seem to be easily archivable with archive.org with all the animations and whatnot, so just in case it changes and the website no longer occurs, here is an offline snapshot of that page saved using Firefox's "Save As" feature.

Comment 6

[Jeff Fortin]

Corresponding WebKitGTK issue: https://bugs.webkit.org/show_bug.cgi?id=291791