636752 - Javascript Galaxy Demo bad Performance

Status: RESOLVED WORKSFORME

(Core :: Graphics, defect)

Description

[Scoobidiver (away)]

The Javascript galaxy demo has a very bad performance in Fx 4.0b12 vs. other browsers:
* Firefox 4.0b12   : 0 fps
* Firefox 3.6      : 8 fps
* Chrome 11.0.672.2: 20 fps

It makes the browser slow responsive.

Comment 1

[Boris Zbarsky [:bzbarsky]]

On Mac, I see 10fps in Fx 3.6, and 20fps on trunk.

On the same hardware, Chrome 11 dev is 20fps.

So this doesn't sound like a js engine issue, since that would be cross-platform.  Graphics is more likely.  What sort of numbers do you see if you disable hardware acceleration?

Comment 2

[Scoobidiver (away)]

In addition to comment 0:
* Firefox 4.0b12 w/o HW accel.: 12 fps

Comment 3

[Boris Zbarsky [:bzbarsky]]

OK, so something is making hardware accel painful here...  Wonder what.

Comment 4

[José Jeria]

Confirming on Win 7. Hardware acceleration on gives me 0-1 fps. Disabling HA gives me around 15-20 fps.

Comment 5

[Bas Schouten (:bas.schouten)]

Confirmed, profiling.

Comment 6

[Bas Schouten (:bas.schouten)]

The reason for the slow performance is that this is using compiite operation source-over and composite operation lighter. Both aren't natively supported by Direct2D and we need to jump through a lot of hoops to make this work. This causes a lot of work and eventually causes us to slow down to a crawl.

Comment 7

[Harsh86]

I get 1fps on IE9 RC too. Maybe if it makes IE9 look bad enough they'll add the required operations in a future version of D2D.

Comment 8

[Timvde]

This is slow on Linux x64 too, both with and without HW acceleration, so it is not D2D only.