[Q] Severe Unsolvable Lag Problem

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Hi everyone,
I have an i9000 and ive tried out many different roms, never even soft bricked it, i have experience with odin etc so i pretty much know what im doing and am not a n00b. i was on darky v10 rc6 and when i upgraded to the stable 10.1 everything seemed fine, but i the impossible game starting lagging really badly, when it never had before, however the rest of the phone functioned perfectly. i tried enabling and disabling the lagfixes. i went over to gingerreal, back to a froyo ROM from docs kitchen, and finally just flashed back to unrooted gingerbread from samfirmware. each time, i wiped the data and the cache, and installed nothing but a fresh copy of the impossible game from the market, and made sure no other tasks were running, but every time, the only issue i could find was that the impossible game lagged. when i got back to stock, i thought i had solved it as it played fine for a few minutes, but the next time i loaded it up it started lagging again. note: i am not this anal about the impossible game, im just worried its symptomatic of a bigger problem with the phone. do you have any suggestions of how i can fix this issue? thanks so much for you help.
theo