optional (but recommended) : Optifine :
http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/1272953-1-8-1-optifine-hd-b5-fps-boost-hd-textures-aa-af
http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/1272953-1-8-1-optifine-hd-b5-fps-boost-hd-textures-aa-af