VAMET: Direct3D Triple Buffering Enabled
GODzillaGSPB: How did you enable triple buffering for d3d? Because the setting in the driver unfortunately just works for opengl as far as I know.
VAMET: ...but use FRAPS only to check FPS, when you want to play not only checking, turn it off, because it will decrease your performance.
GODzillaGSPB: Is this true? Will it lower the performance just when the fps are displayed, or even when it's just running in the background without any onscreen functions enabled?
Won't lower it enough to make a lot of difference. If it's doing nothing (not displaying, not monitoring, not recording), it will do nothing until it's hotkeyed. But it's still using memory, and if memory is in short supply, you'll do better with it not running at all.
Displaying and monitoring frame rate are lightweight. (Monitoring requires writing to a file from time to time, so it's a little busier). Recording will defininitely hurt frame rate, a lot.