560088 - Poor scrolling performance when using gradients

Status: RESOLVED WORKSFORME

(Core :: Layout, defect)

Description

[José Jeria]

Build ID:
Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.3a5pre) Gecko/20100417 Minefield/3.7a5pre

Steps to reproduce:
1. Open testcase
2. Scroll page by dragging scrollbar
3. Notice choppy scrolling

Additional information:
Scrolling should be done by dragging the scrollbars, since using the scroll wheel is faster.

Removing the gradient from the body makes the page scroll smoothly

Comment 1

[José Jeria]

Attachment: The testcase

Comment 2

[José Jeria]

Direct2D enabled helps a bit here

Comment 3

[José Jeria]

Also tested on Mac OS X, both 3.6 and trunk and scrolling is much smoother compared to Windows.

Comment 4

[Boris Zbarsky [:bzbarsky]]

Sounds like this is gated on painting (no surprise).  ccing folks who might know about that.  Are we repainting too much, or just being slow to repaint?

Comment 5

[Boris Zbarsky [:bzbarsky]]

Quartz debug does claim that the whole viewport is repainted on scroll.

Comment 6

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

I believe quartz debug flashes for all scrolling. What we have here is probably just slow pixman gradient drawing.

Comment 8

[José Jeria]

I don't see this issue anymore, I assume that bug 564991 fixed this?

Comment 9

[José Jeria]

This WFM for a while now. Please reopen if you still see this.

Comment 10

[Clemens Eisserer]

Could somebody please re-open that bug, and change the platform to "Linux".

I still see horrible scrolling speed with gradients involved, especially on html5test.com

Comment 11

[Boris Zbarsky [:bzbarsky]]

> Could somebody please re-open that bug, and change the platform to "Linux".

This bug was about a specific issue on Windows.  If there is also an issue on Linux, please file a new bug on it.

Comment 12

[Clemens Eisserer]

I did about a year ago, but my report was marked as a duplicate of this bug.
Please re-open bug 568630

Thanks

Comment 13

[Boris Zbarsky [:bzbarsky]]

Yep.  Done.  Sorry about that duplicate marking.  :(