Extra arguments

If you want more performance out of Minecraft, you can add in a bunch of extra arguments into the Settings tab. To get the best performance possible, add the below command into the Extra Arguments box in the Setting->Java tab and click the Save button.

This is only for 64 bit systems. To see if you are running 64 bit Java or not, check the Memory dropdown box in the Launchers Settings->Java tab and if your only option is 512 and 1024 then click here for ways to possibly resolve this issue.