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[Stefan Krause <stefan.krause@xxxxxx>]

Public bug reported:

Binary package hint: compiz

OpenGL performance is much worse with Ubuntu 10.04 Alpha 3 than with 9.04 when using compiz (i.e. visual effects are turned on) in windowed mode.
I found that for some demo I've built  Ubuntu 9.04 was about 27% faster and confirmed those findings with the unigine benchmark.

Here are the number for the Unigine_Tropics-1.2 (windowed_1024x768.sh, default settings):
10.04 With Effects Turned On: 27.9796 FPS
9.10 With Effects Turned On: 32.0972 FPS

I think the problem is due to compiz because if I disable all visual effects the performance is pretty much equal for 9.10 and 10.04:
10.04 Without Effects Turned On: 34.4443 FPS
9.10 Without Effects Turned On: 34.794 FPS
(The same is true for my own program)

As clearly can be demonstrated by those numbers metacity performs
equally, but compiz got much slower for 10.04 Alpha 3.

I'm using the same nvidia driver release 195.36.08 (yes that's the hot
one ;-) on both systems. The driver settings regarding quality, vsync
etc. are equal.

Please let me know if you need further details.

** Affects: compiz (Ubuntu)
     Importance: Undecided
         Status: New

-- 
opengl performance regression with compiz
https://bugs.launchpad.net/bugs/533495
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