I am kinda having same problem, especially on South City with patch Y, because the new look of it, I don't have the best/good videocard at all also, but I sometimes get even 150 FPS, South City is the biggest problem for me, about 10 cars and my FPS starts to jump up and down, and you couldn't drive anymore normal... I wish somehow that I could get old South City textures to new patches, but seems I can't, that sucks, that's why I never race on South City really thou...