While smooth-scrolling is pretty performant in either the horizonal or vertical directions, diagonal smooth-scrolling (as done by tapping, say, right-arrow and down-arrow repeatedly) really seems very much slower and jerkier on my system, and takes longer to come to rest. It's fine with smooth-scrolling turned off. I'd expect diagonal smooth-scrolling to be roughly comparable in speed/smoothness/cpu-burn as smooth-scrolling a similar distance horizontally or vertically.
Right now when you smooth-scroll diagonally, we repaint the bounding box of the damage areas, which is the whole page. There's no easy way to avoid that.
Ah, I see. Ouch.
I've had ti uninstall Mozilla 2X because when i take the recent upgrade, scrolling is Jerky and skidding...Rick
Assignee: roc → nobody
Is this behavior still seen?
It's better you ask the reporter or anyone else that commented they reproduced it. I just don't have time to test old bugs like this, sorry.
Component: Layout: View Rendering → Layout: Web Painting
Product: Core → Core
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