246393 - Diagonal smooth-scrolling is jerky and slow.

Status: NEW

(Core :: Web Painting, defect)

Description

[Adam D. Moss]

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.

Comment 1

[Robert O'Callahan (:roc) (email my personal email if necessary)]

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.

Comment 2

[Adam D. Moss]

Ah, I see.  Ouch.

Comment 3

[Rick Corbin]

I've had ti uninstall Mozilla 2X because when i take the recent upgrade,
scrolling is Jerky and skidding...Rick

Comment 5

[Wayne Mery (:wsmwk)]

Is this behavior still seen?

Comment 6

[Mats Palmgren (inactive)]

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.