597540 - Dotted borders are slow in painting/scrolling

Status: RESOLVED FIXED

(Core :: Layout, defect)

Description

[Martijn Wargers (dead)]

Attachment: testcase

Scrolling with 1px dotted borders is slow and it seems to be getting slower with more recent builds.

See testcase, when pressing the button, the scrolltest starts.

Some numbers I get:
Seamonkey 1.9.1 build from 2010-07-01: 14217ms
Firefox 3.6.8: 35756ms
Minefield from 2010-09-16: 88801ms (this is with d2d enabled)

This is on Windows 7.

Comment 1

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

We should fix the regression for final. It's probably a D2D bug. (Can you confirm that performance is better with D2D disabled? If so, move it to Graphics.)

Comment 2

[Martijn Wargers (dead)]

I don't know (anymore?) to turn off D2D. I've set mozilla.widget.render-mode to 0 and layers.accelerate-all to false and then I restarted, but in about:support Direct2D Enabled is still described as true.
Btw, about:support is the url where I was seeing the performance issue.

Comment 3

[Timothy Nikkel (:tnikkel)]

The pref is now called gfx.direct2d.disabled

Comment 4

[Bas Schouten (:bas.schouten)]

Martijn, can you direct me to that scrolling test bookmarklet of yours?

Comment 5

[Timothy Nikkel (:tnikkel)]

Is it the one in bug 588402 comment 19?

Comment 6

[Bas Schouten (:bas.schouten)]

(In reply to comment #5)
> Is it the one in bug 588402 comment 19?

I think so! Thanks.

Comment 7

[Harsh86]

Is this the reason about:support is sluggish to scroll?

Comment 8

[Harsh86]

Yep, changing dotted to solid using firebug brings scrolling to normal responsiveness. I'm on D2D+D3D10 Layers, so depends on Bug 588271?

Comment 9

[Bas Schouten (:bas.schouten)]

Bug 588271 will fix this for D2D. Note these dotted borders are also very slow on GDI though, I'm not sure if that will be fixed.

Comment 10

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

I'm calling this fixed by 588271.