Not sure if it is allowed with external links, but this is the program I use, it is called Cleanmem. It doesn't work for helping more than one time, but speeds up your PC after going to different screens, closing and opening many tabs, and heavy cpu use because of flash:
I hope a moderator will correct me/this post if he or she doesn't think this is right
Mod Edit.. Hi the link was removed , external links are not allowed sorry