IMac Retina (M290X). Games lagging @ 1280x1024. Whats wrong?

Hello!
I just changed my previous iMac (with 2560x1440 display / GF680MX) to Retina / M290X
All the games are LAGGING now at any resolution!!! Whats wrong?!
Even Starcraft 2 and Diablo 3 LAG violently! Why?!
In-game resolution is set to 1280x1024! They performed nice on my previous, GF680MX, model!

Hello! Great thatnx for help!
I managed to defeat lags:
1) Lags GONE after clean reinstall (initially, I restored iMac state from Time Mcahine copy) AND turning ON frame syncronization (?!). Will continue investigation what exactly cause lags - as u know frame sync usually degrades performance and I cannot imagine how restoring state from TM could cause lags. Will try to fugure out what exactly caused them and report the result. Maybe some other people can come acrooss this problem!
2) Just in case: in Russia return policy is the same

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Clayton Rhoades wrote:
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From: ʇɐb ɹəuəllıʍ <[email protected]>
To: prhuds00 <[email protected]>
Sent: Tuesday, November 8, 2011 5:09 PM
Subject: i keep having to install flash player 11 every time i play games.whats wrong?
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IMac Retina (M290X). Games lagging @ 1280x1024. Whats wrong?

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