There is a software called GameGain. Google it and download the trial version. It might boost the performance. Atleast it did so in Doom 3 for many people.
As for GTA3 specifically, there is a mod available that would remove the random pedestrians, the garbage blowing across the city, distant planes and seagulls and other such random objects that are not integral to the gameplay. Removing them greatly improves framerates.
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The ANGRY Pixel proudly announces the launch of India's first ever launch center for a game, The ANGRY Pixel - Milestone Interactive Street Fighter 4 Launch Center
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