RESOLVED FIXED 225621
Incredibly poor scrolling performance while loading other parts of website 
https://bugs.webkit.org/show_bug.cgi?id=225621
Summary Incredibly poor scrolling performance while loading other parts of website
Kdwk
Reported 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.
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