I can help you make your minecraft faster

First:
The Easiest Part
Lower your Settings (all!).

Second:
Install CCleaner, Game Booster, ETC...
to enhance your performance on playing minecraft.
Links:

CCleaner: www.piriform.com/ccleaner/download
Game Booster: www.iobit.com/gamebooster.html

Third:
Install Optifine/Optimine Mod
can lower your minecraft details
Links:

Optifine: www.minecraftforum.net/topic/249637-132-optifine-hd-b3-fps-boost-hd-textures-aa-af-and-much-more/
Optimine: www.minecraftforum.net/topic/124417-v13-optimine-fps-boost-optimization-updated/

Fourth:
Get some money and buy some nice graphic card and memory for your pc.

I hope it works i used them all and tried but Works!!