Maybe other things in your game loop are causing a problem... if you post the code in question, you might get an answer where you are losing time ?
Are you using Grabimage or Copyrect inside the game loop?
Are you using text commands? There is an issue witn some NVidia driver not implementing them correctly, though this has been fixed in late edtition drivers...
Are you using Grabimage or Copyrect inside the game loop?
Are you using text commands? There is an issue witn some NVidia driver not implementing them correctly, though this has been fixed in late edtition drivers...