487267 - wii.ign.com: When not at default zoom, slow scrolling of page with fixed background

Status: RESOLVED FIXED

(Core :: Graphics, defect)

Description

[Dimitrios]

At the discussion of bug #90198, a FF user reported very slow scrolling on http://wii.ign.com/. I confirmed the slugginess on my Pentium 6320 (1.86GHz Core Duo). Simplified test case coming.

Comment 1

[Dimitrios]

Attachment: background image for the simplified test case

Comment 2

[Dimitrios]

Attachment: simplified test case

Using the attached simplified test case (it's only a fixed CSS background and some plain text), I measured the time to scroll from the top to the bottom of the page, using the bottom arrow key of the keyboard. My browser was at full screen.

FF 3.08 (Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.8) Gecko/2009032609 Firefox/3.0.8)
default zoom: 2 sec
zoom 1 level (in or out):  8.8 sec

FF trunk (Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2a1pre) Gecko/20090406 Minefield/3.6a1pre)
default zoom: 2 sec
zoom 1 level (in or out): 7.4 sec

Graphics Device Driver: NVIDIA 6.14.11.7516 at 1600x1200

Comment 3

[Dimitrios]

As you see, there is a 16% improvement in latest trunk but it's still sluggish. Performance is not unacceptable for me but I am sure there are others with stronger complaints. Btw, IE7 does not suffer from this performance hit on this test case, at any zoom level.

Comment 4

[RNicoletto]

Dupe of bug 361754?

Comment 5

[Dimitrios]

(In reply to comment #4)
> Dupe of bug 361754?

Probably not, as this one appears only at *non-default* zoom level. But surely it appeared after Cairo, because an FF2 build fares much better on my minimal testcase.

I see further improvements (12% wrt to 20090407 trunk) on FF3.5b4 (Gecko/20090423): 
default zoom: 2 sec
zoom 1 level (in or out): 6.5 sec

Comment 9

[Alice0775 White]

(In reply to comment #7)
> *** Bug 480806 has been marked as a duplicate of this bug. ***

Because the regression range is different,
I think the Bug 480806 of independent.

Comment 10

[Ryan Jones-Ward [:sciguyryan]]

I can no longer reproduce the slow scrolling effects with the latest hourlies.
Can anyone on Mac or Linux still reproduce this? If anyone else can reproduce this then please re-open this bug. Thanks.

Otherwise... -> Fixed by bug 564991.