OptiFine

OptiFine HD for Minecraft 1.7.10 is a performance enhancement modification which doubles the FPS (frames per second) rate inside your world. It makes use of your on-board/PCI express video card to provide support for improved graphics by adding HD textures, animations and eye candy to your Minecraft. It automatically installs HD texture packs and allows you to modify rendering, fog, weather and various visual options to better customization. The latest version supports; OptiFine HD 1.7.10 and 1.7.9

OptiFine HD Mod Features:

 * FPS boost – Makes a significant change (2x) in your game performance.
 * Support for HD Textures – Automatic installation for HD Texture packs of any size, makes MCPatcher HD Fix obsolete..
 * Configurable Smooth Lighting – Smooth lightning with better shades.
 * Smart Advanced OpenGL – Enchanced Graphic card support.
 * Fog control – Manage the in-game fog according to your needs
 * Mipmaps – Makes smooth objects
 * Better and realistic Grass/Snow
 * FPS control – Limit the FPS rate for stabilization
 * Imrpoved Chunk Loading Control
 * Configurable Details – Control every visual inside game
 * Configurable animations – Supports custom animation for every object
 * Fast Texturepack Switching – Switch texture packs w/o quitting game.
 * Debug – Helps you recoever if something goes horribly wrong.
 * Time Control – Control time in creative mode.
 * Autosave your settings.

Source : http://www.6minecraft.net/optifine-hd-download/