In ICS there is a setting under "Developer Options" called "Force GPU Rendering". According to the link below this may improve performance at the expense of some possible rendering problems on older apps. I have set it to "on" just now and things seem faster, but that may be illusion. I will post back here if I come across any problems.
What is Force GPU Rendering in Ice Cream Sandwich? | Pocketnow
What is Force GPU Rendering in Ice Cream Sandwich? | Pocketnow