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In the interest of me optimizing stuff, what are some good JVM arguments. (Meaning I have no clue what they actually do, I just know where to paste them)
This is one of the reasons the new (currently beta) Mojang loader automatically loads a Ver. 1.8 JRE... They are implementing Java features that may not be in older versions and want to keep Java related support issues to a minimum.
If you use MC 1.6 packs or older you should probably stick with Java 1.7. The client should already have the required arguments listed in the config tab, you just need to change the values to those above.