1969834 - Occasional stuttering on https://ulucode.com/random/webgputests/linked demo page

Status: NEW

(Core :: Graphics: WebGPU, defect, P5)

Description

[Bogdan Maris, Desktop Test Engineering]

Found in

• Nightly 141.0a1

Affected versions

• Nightly 141.0a1
• Firefox 140.0b3

Tested platforms

• Affected platforms: Windows 11, macOS 13 (not sure if mac is affected by the same cause, profiler bellow)
• Unaffected platforms: Ubuntu (did not have a capable machine to run the demo page)

Preconditions

• none

Steps to reproduce

1. Visit https://ulucode.com/random/webgputests/linked

Expected result

• The animation is smooth and no stuttering or choppiness can be seen.

Actual result

• There can be seen occasional stuttering in the demo page. On Windows this is more obvious and frequent.

Regression range

• I would not say that this is a regression since the builds before bug 1962753 was fixed also had issues in displaying the demo page.

Additional notes

• Here are two profilers recorded for both Windows 11 - https://share.firefox.dev/45rh6PG and macOS 13 - https://share.firefox.dev/3HhizOJ
• I did try to reproduce on Firefox 139 but apparently webGPU is not available, maybe I need to enable some prefs for that, not sure.

Comment 1

[Teodor Tanasoaia [:teoxoy]]

Thanks for the bug! The profiles indicate that the stuttering is due to GC.

Comment 2

[Jim Blandy :jimb]

P5 for performance. P5 is not death, we will get to these.