Imaris
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I played a bit of deathmatch in Unreal Tournament 3, and I totally dominated some noobs. Yes, it's from 2004, and the graphics are dated.
But I'm having some issues with vertical sync; the graphics are stuttering. It's strange.
Specifically, the graphics, the redrawing, or whatever it is, because there are no actual slowdowns or lag, everything runs smoothly otherwise.