Sad that your post got into a flame war, I was too interested about the input lag. Anyway if I want to use Direct3D, which is the best option?
I ran without noticeably input lag in Direct3D by enabling "force vsync" and disabling "triple buffering" in the Nvidia control panel and disabling waitvsync and triple buffering on MAME, that way I get a smooth scrolling with almost no input lag.
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