Game performance low on new iMac 24"

Hello, I just got my new 24" iMac with intel Core 2 Duo extreme at 2.8GHz, 4GB RAM and Radeon HD2600 pro 256MB. It self and system(Leopard) are both brand new. I haven't install any app but only World of Warcraft for Mac version yet.
But I find that my imac cannot do well on good video quality. The FPS ingame is only around 30 at low quality, and low as 3-6 at high quality. This cannot be if considering the hardwire my mac equipped.
How can I solve this issue? I have tried a few 3rd-party radeon video drivers but they didn't work.

I have experience with many systems being a tech support guy... but the reason your not seeing better performance is that the X1900 is actually a better card than the 2600. Don't let the higher numbers fool you. The 2600 is a low end card of the 2000 series whereas the 1900 is a high end card of the 1000 series.
A good chart for seeing how different cards stack up:
http://www23.tomshardware.com/graphics_2007.html?modelx=33&model1=1066&model2=72 9&chart=286
The 1900 has a faster core clock(graphics processor speed) and memory clock (memory speed) compared to a 2600. Plus the 2600 has a pretty bad reputation as a weak card. Any ATI 2000 series card pretty much below a 2900 was a disappointment. Anyways, the best thing for you to do is turn resolution down, antialiasing/sampling down (off preferably for better performance) and tune the other settings to see which affect you the most so you can turn on as much eye candy as possible.
For all the wild sweats and bloody regrets,
None knew so well as I.
For he who lives more lives than one:
More deaths than one must die.

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