Please move your mouse in and out of the image to compare the effect of Anisotropic Filtering. The first image is without Anisotropic Filtering, the MouseOver image is with 4x Anisotropic Filtering. Pay attention to the bottom and walls, the textures are sharper with active AF and the over all IQ is smoother. Also note, that between 0x AF and 4x AF is literally no FPS loss. On the screenshot it even shows +2 FPS with AF active, but this is to neglect.

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