1902867 - WebGL aquarium - Firefox much slower than Chromium/Edge

Status: NEW

(Core :: Graphics: CanvasWebGL, defect)

Description

[08xjcec48]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:127.0) Gecko/20100101 Firefox/127.0

Steps to reproduce:

• Go to https://webglsamples.org/aquarium/aquarium.html
• Set it to 20000 fish

Actual results:

Edge: 60 fps
Firefox: 33 fps

Both browsers have uBlock Origin with the same selection of lists.

https://share.firefox.dev/3xkZSFa

Comment 1

[08xjcec48]

Attachment: about-support.txt

Comment 2

[Ashley Hale [:ahale]]

Looking at the profile, I think the way we do WebGL remoting (content processes sending IPC messages to the GPU process) is probably responsible for all of the difference in observed performance here, whereas chromium-based browsers run the OpenGL ES calls in the content processes (i.e. every content process is a GPU process), we do it remotely to avoid giving the content processes access to the GPU (a security/performance tradeoff).

Comment 3

[Sotaro Ikeda [:sotaro]]

chromium seems to use CommnadBuffer to transafer GL calls to GPU process. Client seems to use GLES2Interface. Actually GLES2Implementation emulates GLES2 over command buffers

• https://www.chromium.org/developers/design-documents/gpu-command-buffer/
• https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/modules/webgl/webgl_context_object.h;l=53

Comment 4

[Jules A [:AreYouAWiiizard]]

I'm seeing even larger difference with 30,000 fish using 5700x/6700XT:
Edge: 80 fps
Nightly: 29 fps
Nightly with Angle disabled: 44 fps

Comment 5

[Jeff Muizelaar [:jrmuizel]]

Here are profiles from Bas:
Chrome
Firefox

They suggest to me our WebGL serialization is a lot more expensive than Chrome's is.

Two thing that stand out:

1. We spending a lot of time shared_ptr incRef/decRef (presumably because it's atomic)
2. We spending a bunch of time zero filling on demand: KiPageFault. Presumably, because we're allocating a bunch of fresh buffers every frame.

Comment 6

[Jules A [:AreYouAWiiizard]]

Just an update from my test last year after 1976241 which was reported to increase fps by ~20%.

Now I'm seeing with same config:
Edge: 20 fps (-60 fps regression)
Nightly: 33 fps (+4 fps, though it was ~32 before 1976241)
Nightly with Angle disabled: 45 fps (+1 fps, though it regressed to ~43 from other changes)