Glossary:Anisotropic filtering (AF)
Anisotropic Filtering is a type of texture filtering that makes textures that recede into the distance appear more crisp. The option to apply antialiasing is present is almost every PC game on the market today. In most cases, the options exists to apply Antialiasing in levels like 2x, 4x, 8x, and occasionally 16x. This is the number of passes the AF algorithim makes on the current textures in the frame, and a higher number can impart noticeable performance slowdown. If you are experiencing low FPS, lowering or diabiling the AF setting is a great way to increase performance.