I stated before that 10.6.4 improved my fps rates (In Portal and HL2 anyway, haven't finished with TF2). I took some screenshots before and after upgrading, in certain areas where games usually lagged a bit for me. For Portal, the final area with GLaDOS. For HL2, when you get outside in chapter Point Insertion, looking at the Citadel.
My specs:
iMac i5 2.66 GHz
4 GB RAM
ATI Radeon HD 4850
My video settings:
Portal (10.6.3)
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Portal (10.6.4)
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This was looking up at GLaDOS. If I turned to the side, fps would go up to around 80. Having open portals would bring it down by 5-10 fps.
HL2 (10.6.3)
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HL2 (10.6.4) First one, menu open; second one, menu closed. I noticed that the menu would bring fps down by around 5-10. Don't know if it's even relevant, but I just noticed it while taking these pics.
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Looking off to the side, the menu had a bigger impact (~15 fps)
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Highest fps I could get was around 180.
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And just for fun, I set MSAA to x2. 10.6.4 was no help in this area.
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So, 10.6.4 improved quite a bit, but antialiasing is still an issue. I still have to see how my performance changed in TF2, if at all.