Just wondering, because between CS and UT, I've noticed OpenGL runs so much smoother than Direct3D. On some levels, the difference is not much, but on others, it's the difference between smoothness and a slideshow.
It's nothing to do with the APIs, it's how well the programmers utilise them. It's no suprise that games based on ID's engines run better under OpenGL, since they were originally designed that way.
I pick whatever API gives me the fastest, problem-free perfromance. It varies from game to game, and some games only have the choice of one API.
D3D, because I can alt-tab back with it, can't with OpenGL. Don't know if that's game specific or not. Shame, because OGL looks so much nicer, speed about the same.
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