I have the same problem and I also like to know how to fix it.. The game runs reaply badly for my usual gaming habits. I use Matrix kernel @ 1.46GHz and the latest CM9 nightly. I get really high bench scores for 4.0.3 and overall performance kicks the ass of my friends' stock Galaxy SII I-9100.
Sent from my Nexus S using xda premium
old Sony Ericsson K750i > old Nokia 6300 > Nokia 5800XM > Samsung Galaxy Ace > Nexus S (I9023) on CyanogenMod 9 RC1, modded "brushed metal" battery door
iMac 21.5" Early 2011:
2.5GHz Intel Core i5-2400S
10GB DDR3 1333MHz RAM
500GB HD + 2TB External
AMD Radeon HD 6750M 512MB