Tweak Java Options
Go into $kojo/etc/kojo.conf, and modify default_options.
Example:
default_options="--branding kojo -J-client -J-Xss2m -J-Xms32m -J-Xmx1024m -J-XX:PermSize=32m -J-XX:MaxPermSize=384m -J-Dapple.laf.useScreenMenuBar=true -J-Dapple.awt.graphics.UseQuartz=true -J-Dsun.java2d.noddraw=true -J-XX:+UseConcMarkSweepGC -J-XX:+CMSClassUnloadingEnabled -J-XX:+CMSPermGenSweepingEnabled"