I botted my way to max, and there is no reason you shouldnt either. Get max before pvm.
Right click on your runescape client shortcut, properties>shortcut>open file locaiton>once thats open click on jagexlauncher>runescape>runescape.prm>right click>open with>notepad> erase everything then copy/paste this
-Djava.class.path=jagexappletviewer.jar
-Dsun.java2d.noddraw=true
-Dcom.jagex.config=
http://www.runescape.com/k=3/l=$(Language:0)/jav_config.ws
-Xmx512m
-Xss2m
-XX:+DisableExplicitGC
-XX:+AggressiveOpts
-XX:+UseAdaptiveGCBoundary
-XX:MaxGCPauseMillis=500
-XX:SurvivorRatio=16
-XX:+UseParallelGC
jagexappletviewer