1759964 - [WebRender] scrolling is very slow on the certain page again

Status: RESOLVED DUPLICATE of bug 1750728

(Core :: Graphics: WebRender, defect, P2)

Description

[Alice0775 White]

+++ This bug was initially created as a clone of Bug #1750728+++

It was partially improvement by Bug 1749380, it seems to have been regressed by Bug 1757002 again. Scrolling becomes jank and slow.
Please see Bug #1750728 comment#17.

Steps to reproduce:

1. Open https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Transforms/Using_CSS_transforms#result_2 (last sample)
2. Wait for page load and rendered
3. Try to scroll the page by Keyboard/Mouse wheel/Scroll bar

Actual results:
scrolling is very slow

Expected results:
Not slow

Regression window:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=2c26f3ae2371ac5ce9e09b263f70772bb0e7cbe6&tochange=9f3cb0197f1ff639627e97ea474596fc6ccb2a1f

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1757002

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

:gw, since you are the author of the regressor, bug 1757002, could you take a look?
For more information, please visit auto_nag documentation.

Comment 3

[Glenn Watson [:gw]]

I'm not sure we need a new bug here as #1750728 is still open and has context about how to fix it (see comment 15)?