While FXAA is lighter than using MSAA, it's still taxing on the graphics cards as shown from these Linux OpenGL test results. Unfortunately, though screenshots couldn't be captured due to the problems with that Timothy Lottes mentioned, but FXAA is a nice improvement although higher levels of FXAA do look better. At least though most mid and high-end NVIDIA graphics cards should be able to handle Fast Approximate Anti-Aliasing with decent speed when using the proprietary NVIDIA graphics driver. It would be interesting too if this FXAA support ends up getting integrated into Mesa from NVIDIA's open-source implementation.
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