1677351 - Poor WebRender graphics performance in Nightly 84 on GNOME w/ Wayland

Status: RESOLVED INVALID

(Core :: Graphics: WebRender, defect)

Description

[lolrepeatlol]

User Agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:82.0) Gecko/20100101 Firefox/82.0

Steps to reproduce:

I went to https://fishgl.com/ and tested performance with WebRender enabled.

Actual results:

I noticed that in Firefox 82.0.3, I had a buttery 60 fps. When I opened the same profile in Nightly, I noticed that the fps had dropped by more than half to about 20.

Note: when I had WebRender disabled, performance was also poor on Stable 82.0.3, so this seems to be a WebRender issue in newer versions.

Expected results:

I should have had the same performance on both browsers.

System information:

• Ryzen 7 1700
• MSI B350 PC Mate
• 16GB RAM
• Gigabyte RX 5700 XT

Video demonstration: https://streamable.com/udpeqd

Comment 1

[lolrepeatlol]

Profiler of Stable 82 while messing around in https://fishgl.com/: https://share.firefox.dev/3eYPeWZ

Profiler of Nightly 84 while messing around in https://fishgl.com/: https://share.firefox.dev/3f2HjYs

Comment 2

[Denis Palmeiro [:denispal]]

Moving to graphics for a closer look.

Comment 3

[Darkspirit]

Please open about:support in Nightly, click on "Copy text to clipboard" and paste it here. Thanks!

Comment 4

[Robert Mader [:rmader]]

Do you by any chance use Fedora? :)

Good WebGL performance only comes in combination with EGL + DMAbuf. Thus you need to:

• have either MOZ_X11_EGL=1 or MOZ_ENABLE_WAYLAND=1 set (the later obviously only working in a wayland session - note that Fedora does this by default)
• check that widget.dmabuf-webgl.enabled is enabled in about:config (should be by default these days

Does that work for you?

Comment 5

[lolrepeatlol]

(In reply to Robert Mader [:rmader] from comment #4)

Do you by any chance use Fedora? :)

Good WebGL performance only comes in combination with EGL + DMAbuf. Thus you need to:

• have either MOZ_X11_EGL=1 or MOZ_ENABLE_WAYLAND=1 set (the later obviously only working in a wayland session - note that Fedora does this by default)
• check that widget.dmabuf-webgl.enabled is enabled in about:config (should be by default these days

Does that work for you?

I used Fedora in the test, but now am on Arch and unfortunately have the same issue in Firefox 83, w/ about 30fps on FishGL. MOZ_ENABLE_WAYLAND=1 is on, and so is widget.dmabuf-webgl.enabled.

Comment 6

[lolrepeatlol]

Attachment: about:support on Nightly 85

I switched to Arch but have the same issue there. I hope this helps.

Comment 7

[lolrepeatlol]

And yes, if it wasn't clear, I have this issue on Stable 83 now, albeit in Arch (on GNOME Wayland). I therefore assume this issue started in 83.

Comment 8

[lolrepeatlol]

Ugh, I'm a little stupid. Indeed, starting Firefox with MOZ_ENABLE_WAYLAND=1 does indeed fix the issue on Wayland, and starting Firefox with MOZ_X11_EGL=1 fixes the issue in Xorg. I'm sorry for multiple incorrect comments. :(