vsync does that. you should turn it off if it's lagging. Heres a recent post I commented on similar to what you are experiencing:
http://www.mameworld.info/ubbthreads/sho...amp;o=&vc=1
I’m convinced Mario is a hobo.
He wakes up everyday in the same clothes, runs around in sewers, and collects coins for a living.
At the end of the day, he uses the coins to buy mushrooms
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