How to make minecraft less laggy and increase frame rate?

Go to settings, turn clouds off and reduce your field of view.

Here are a couple things to do:
Go to Options, then click on Video Settings
Take the graphics level down from Fancy to Fast
Turn off Smooth Lighting or set it to Minimum instead of Maximum
Bump up the framerate a little bit (if that will even help, i don't mess with it though)
Take the Render Distance down however much will help
Turn off clouds

Do any of these things (you don't necessarily need to do all of them, just enough to help) and it should fix it