[Webkit-unassigned] [Bug 199376] New: View is locked to 60 FPS

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199376

            Bug ID: 199376
           Summary: View is locked to 60 FPS
           Product: WebKit
           Version: Other
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: grmat at sub.red
                CC: bugs-noreply at webkitgtk.org

Created attachment 373256

  --> https://bugs.webkit.org/attachment.cgi?id=373256&action=review

vsynctester screenshot epiphany

GNOME Web 3.32.3 (WebKitGTK+ 2.24.2)

It seems that epiphany's output is locked to 60 FPS, which results in unpleasant behaviour e.g. for users that have 75 or 144 Hz screens. The picture is stuttering and performance is bad.

The 60 FPS lock can be observed on the following test pages with a non-60 Hz screen:

- https://testufo.com/photo
- https://www.vsynctester.com/ (this one even reports "CATASTROPHIC VSYNC FAILURE", though I haven't investigated how this test is implemented, e.g. what this means)
- https://www.shadertoy.com/view/3l23Rh (this one might be heavy on your GPU, make sure to scale down epiphany's window to get less load and allow the full refresh rate)

Firefox by default (without layers.acceleration.force-enabled) is also locked to 60 FPS, but even in this case performs clearly better than epiphany. Chromium is doing good. Screenshots are attached

Redirected from https://gitlab.gnome.org/GNOME/epiphany/issues/833

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