Bug 225621

Summary:	Incredibly poor scrolling performance while loading other parts of website
Product:	WebKit	Reporter:	Kdwk <kdwkleung>
Component:	WebKitGTK	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	bugs-noreply, webkit-bug-importer
Priority:	P2
Version:	Other
Hardware:	PC
OS:	Linux

Description Kdwk 2021-05-10 16:42:50 PDT

On some sites, like reddit.com, performance is extremely poor.

As can be seen in screencast attached, simply scrolling on reddit.com results in extremely low frame rates (like 1-2 fps). I did some more investigation and found that performance on websites that continuously loads images and videos as part of an infinity scroll feed.

Another example would be YouTube when loading the thumbnail of recommended videos

Firefox handles this just fine.
Note: I am not using a touchpad, but Surface Arc Mouse, which still uses steppy scroll.