Very poor GPU performance with iMac Mid 2011 (i7) and Radeon 6970


macrumors 6502a
Aug 13, 2008
Coventry, UK
On my iMac I got 93fps on Mavericks then 88fps on Yosemite.

After the last couple of updates Yosemite is showing 92.25fps now.

So no major difference for me

Der Kommandant

macrumors member
Sep 25, 2012
The Netherlands
I think that Apple doesn't optimize their drivers for the iMac 2011 models as they used to. Since Mavericks the GPU performance has gone downhill. A few months ago I installed Snow Leopard and it was (and still is) much faster than Mavericks and Yosemite.
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