It allows Minecraft to run faster and look better with full support for HD textures and many configuration options. The official OptiFine description is on the Minecraft Forums.

Show all versions OptiFine - Minecraft performance tuning and advanced graphics

OptiFine - Minecraft performance tuning and advanced graphics

OptiFine enhances Minecraft performance and graphics.

Make sure to install OptiFine last, so that no other mod is overwriting the OptiFine classes. Exceptions are mods which are specially designed to be installed after OptiFine.

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- updated installer to set OptiFine profile logo - added Random Entities check for moon phase, day time and weather (#2931) - added Random Entities check for health (#2958) - fixed Cape …