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added info on windows aero
[[CRT tvs|CRT TVs]] and monitors have no display lag.
===Windows Aero===
If you're using Windows Vista/7, having [http://en.wikipedia.org/wiki/Windows_Aero Aero] enabled will add a noticable amount of input lag because it forces vertical synchronization at the OS-level.
===GPU driver latency===
There is video latency caused by the GL drivers in WIndowsWindows/Linux. It is a total black box and they do all sorts of crazy buffering schemes under the hood for all sorts of purposes - better scores with benchmarking tests, better "game" results - but it is actually counterproductive when your aim is low-latency audio/video synchronization for emulators - you don't want all this stuff going on in the background. This applies to both GLX X11 drivers and Windows GL/D3D drivers - both are full of bad hacks and codepaths that cater to benchmarking apps and games.
Hard syncing option in some emulators can reduce or remove this.
*Linux OS in KMS mode
To disable Windows Aero under Windows Vista/7, select the Basic or Classic theme under Control Center > Personalization, or disable desktop composition under .exe properties > Compatibility. Desktop composition will also be disabled by playing under non-windowed fullscreen. In Windows 8, desktop composition cannot be disabled manually.
==References==
