On Sat, 21 May 2011, cyrille henry wrote:
from my experience, Gem is 2 times faster on the same computer using ubuntu than osX. thanks to nvidia profiling tools, Nicolas pointed that gem is limited to 50% usage of the GPU. there is certainly a limitation somewhere on osX preventing application to use full performance of the hardware. so, you applications are slower, but the interface will always be smooth...
There's a setting in Gnome/Ubuntu for choosing no effects, normal effects, extra effects. This may make a difference. What kind of performance difference do you get when you change that setting ? It might explain part of what happens on OSX, perhaps (where, afaik, you don't have such a setting, and effects level is somewhere between ubuntu's normal and extra levels).
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