VanillaFix is described as 'mod that improves performance and fixes bugs and annoyances in vanilla Minecraft. Tripling FPS is common, try it for yourself if you don't believe it!'. There are seven alternatives to VanillaFix for a variety of platforms, including Windows, Linux, Minecraft, Mac and Minecraft Forge. The best alternative is Wurst, which is both free and Open Source. Other great apps like VanillaFix are Sodium (Free, Open Source), OptiFine (Free), Minecraft Shaders (Free) and Less Lag (Free).