compiz team mailing list archive

[Daniel van Vugt <daniel.van.vugt@xxxxxxxxxxxxx>]

Yes, I've seen the same issue with nvidia for a long time (before 310).
It is horribly slow if you have vsync enabled in the driver and compiz.
I suspect the reason is this bug. Nvidia appears to push lots of
graphics commands through the X event queue, which no other driver does.
So nvidia's hyper-sensitive to X event traffic and can slow down easily.
That's the theory.

Alistair: Please note that glxgears IS doing 4000 FPS when it says so.
Just like any software benchmark it's telling you the number of frames
it has rendered per second. In a compositing environment this has
absolutely nothing to do with the physical frame rate however. You
should use the compiz Benchmark plugin to get the real physical frame
rate.

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https://bugs.launchpad.net/bugs/1049214

Title:
  [nvidia] XSync usage is a massive bottlenecking factor (nvidia
  performance regression in Compiz 0.9.8+)

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