792527 - AlphaBoxBlur paints very slow

Status: UNCONFIRMED

(Core :: Graphics, defect)

Description

[kamulos]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/18.0 Firefox/18.0
Build ID: 20120918030553

Steps to reproduce:

Some pages have a very bad framerate when scrolling. I occasionally started the gecko profiler and most of the time the painting of AlphaBoxBlur was the culprit.

Examples:
Bug 718453
Bug 732938


Actual results:

Box Shadows seriously harm the browsing experience.


Expected results:

Optimizations would have a big impact.

Comment 1

[Lawrence Mandel [:lmandel] (use needinfo)]

Bas - I have a note from our Oct 4 Snappy meeting that you were to add a Telemetry probe to help measure for this issue. Did you get to do that?

Comment 2

[Bas Schouten (:bas.schouten)]

(In reply to Lawrence Mandel [:lmandel] from comment #1)
> Bas - I have a note from our Oct 4 Snappy meeting that you were to add a
> Telemetry probe to help measure for this issue. Did you get to do that?

I decided to just make it faster. We can still add telemetry of course :).

Comment 3

[Lawrence Mandel [:lmandel] (use needinfo)]

Bas - Did you already make this faster in bug 509052? Can this be resolved? Should it be duped?