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I also followed a suggestion of delete & reinstall, and it's working now. I haven't had time to play a full game, but the few minutes I did play seemed fine - although I've got everything turned low and/or off.
 
2.4 Ghz Macbook, 320M, 4 GB Ram

Left For Dead Two -
Runs about the same. Still mostly unplayable at 1280x800, everything else at lowest settings.

I get fantastic frame rate under XP at 1080p.

I wonder if Steam has to make some updates before we see any noticeable improvements, but as it is, few 3D games are available on my machine. Granted, low end laptop, so my expectations should be lower... ;)

Unplayable? I play on a mid-2010 Mac Mini just fine at 1280x800 with friends all the time. My hardware = your hardware.
 
Ok, I haven't noticed any major performance gains in both WoW or SC2, HOWEVER, what I have noticed is that both of those games, after a certain amount of time playing them just suddenly drop to 10 fps.

No reason for it, just randomly drops.

I can make it a playable 20fps at lowest of low settings, but yeah. Annoying.

This only happened after I reinstalled my computer, and updated to 10.6.5. I am using a 2010 Macbook Pro 15", cheapest config.

Anyone got any ideas?
 
I found sc2 ran with slightly better framerates after updating to 10.6.5. It may just be me, but that's what I've found. Late 2008 aluminum unibody MacBook.
 
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Flash SWT said:
I'm only seeing a very minor increase in FPS in Team Fortress 2.

.

What Mac are you running. And what are your average frames?
 
Interesting. I was late to the game with Starcraft 2. I never even started playing it until the OSX update was already out. I guess I missed out on the lesser performance.
 
No improvements here :/

iMac 27@i7 - 2,93 + SSD

WoW settings low => 200 FPS
WoW settings recommded => 30-60 FPS

wich is not enough I think :/
 
My mbp i5 seems to be running source games at a minimum of +8fps and a maximum of +15fps, as compared to tf2 on a 32/32 filled server running at ~25fps in the course of action (rockets flying, fire blowing, demos spamming). Much more playable at this points usually stable at ~33fps.
 
Same here... No (noticable) change. Haven't tried low settings though.

WoW settings ultra - multisampling 1x => 30-60 FPS
WoW settings ultra - multisampling 4x (bootcamp) => 130-180 FPS

The difference is just ridiculous.

Can you tell us your Mac-Hardwareconfiguration?
After reading your post I'm really keen to install WoW on my Bootcamppartition... but I know that will make me spending more time in Win7 and I don't really want to :p.

Well I'll tell you the diference...

Cheers
 
Less stuttering in HL2(Biggest difference for solving the stuttering was upgrading to a 7200 rpm hard drive, most noted when someone spoke.) for me and a bit smoother SC2 performance. 9400m Macbook Pro
 
Same here... No (noticable) change. Haven't tried low settings though.

WoW settings ultra - multisampling 1x => 30-60 FPS
WoW settings ultra - multisampling 4x (bootcamp) => 130-180 FPS

The difference is just ridiculous.
I would assume that other settings (Vsync in particular) differ between OS X and Bootcamp, or that there's a bug somewhere.
 
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