"present a frame for every VSync: when disabled madVR only presents new frames when needed, relying on D3D11 to repeat frames for each VSync."
Search the last week's pages of the madvr thread about this. He said that we should disable it for more speed if we have certain setups. I don't recall how but I'm in that group, I have an R9 290 on Windows 8.1 64.
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