1665030 - Slow Performance on onetoldstories website on MacOS with WebRender on

Status: RESOLVED WONTFIX

(Core :: Graphics: WebRender, defect, P3)

Description

[Rares Doghi, Desktop QA]

[Affected platforms]:
Platforms: MAC OsX 10.15

[Preconditions]:
Ensure both gfx.webrender.all = true

Steps :

1. Launch the Firefox browser and reach https://onetoldstori.es/yelloworld
2. Click the Middle of the screen and then drag to the right as much as possible in order for the animation to start moving as fast as possible.

Expected Results :
The Animation for the entire story should run smooth and at a fast pace.

Actual Results :
The animation of the story moves slow, sometimes drops frames, if the user stops and starts dragging the mouse again it will start at a slower pace.
With WebRender off the animation is not as fast as chrome but its a faster smoother experience.

I also recorded this issue but I can only upload it on drive since its over 200 mb, the first part of the video is CHROME, then Nightly without Webrender and the last one is Nightly with WebRender ON:
https://drive.google.com/file/d/1sUQZqQB3eBTlyIDptabsJ2kc7OY2H-vV/view?usp=sharing

Comment 1

[Rares Doghi, Desktop QA]

I think the severity for this issue should be an S3 since it runs slower on that specific website with WebRender on

Comment 2

[Matt Woodrow (:mattwoodrow)]

Profile: https://share.firefox.dev/2EMHDwU

Looks like this is WebGL, so bug 1664804 (removing a copy) might help, and bug 1667916 might help more.

It also looks like we spend a lot of time in glBufferData, similar to bug 1599502 and bug 1642495.

Comment 3

[Glenn Watson [:gw]]

Server no longer exists.