One of the more bizarre things in Vice City for me...
My game lags...especially when lots of thrash come into picture. Like, when driving and walking you can already see the screen twitch and lag. When I crash a car into another you feel like your running under a Pentium I or something. Now my PC is twice as good as the reccomended specs and I can run GTA3 and San Andreas without any problems.
The problem occured just like that. I had a trainer installed so I removed and reinstalled Vice City, but that did not help.