579794 - Slow scrolling with some fixed background pages

Status: RESOLVED FIXED

(Core :: Layout, defect)

Description

[Ryan Jones-Ward [:sciguyryan]]

Filled at the request of Robert O'Callahan. This is a meta bug for any slow scrolling performance bugs on pages with fixed backgrounds.

Comment 1

[Matthew Turnbull [Bluefang]]

I'm assuming we should be posting sites as comments to this bug?

http://roosterteeth.com/ scrolling went from ok or painful.

Comment 2

[RNicoletto]

(In reply to comment #1)
> I'm assuming we should be posting sites as comments to this bug?
> 
> http://roosterteeth.com/ scrolling went from ok or painful.

With latest trunk on Windows XP with smooth scroll ON I get slow scrolling. With smooth scroll OFF no problem.

Comment 3

[Guilherme Lima]

Resolved WFM just like the great blocking bug?

Comment 4

[Thomas Bertels]

Check also bug 90198 attachment 90636 [details].
And compare it with attachment 90639 [details] cpu usage.

Comment 5

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

Thomas, do you have "GPU Accelerated Windows">0 in about:support? I kind of expect scrolling to be slow-ish on a slow machine if you don't have GPU compositing, but it should be fast if you do.

Comment 6

[Thomas Bertels]

No, I don't, the GPU isn't supported.
By the way, the GPU isn't part of the requirements mentioned in http://www.mozilla.org/en-US/firefox/25.0/system-requirements/

The CPU we're talking about is an AMD XP 2500+ which, according to http://www.cpubenchmark.net/singleThread.html, is comparable to the average Pentium 4 (540 vs 875-343).

However, this isn't reproduceable either with Chrome or IE, where scrolling using the scrollbar is much smoother. IE being the smoothest.
So it seems there's room for improvement.

Comment 7

[Ryan Jones-Ward [:sciguyryan]]

This seems to have been fixed quite some time ago. I'm going to mark this one as resolved -> fixed. If there are still bugs like this then I think a new bug should be opened for them.

If anyone disagrees then please re-open!