Re: Starcraft unplayable on my nvidia - but works OK(ish) on Intel card
I assume you are playing Starcraft in WINE? If you are, you should upgrade to the latest version and put the following string keys in the WINE registry (wine regedit) at this location: HKCU/Software/Wine/Direct3D.
Doing this should help your performance tremendously. Just make sure you are using a recent version of WINE.