Are you serious? You have to mess with the maximum memory allocated to the GC all the time with java processes. Also the JVMs default settings basically assume it is the only process running. It will keep hogging a huge amount of memory even if the memory allocated to the GC is 60% empty unless you configure the GC properly. Wasting memory and stealing it from other processes which potentially causes swapping or crashing is far worse than any increased time spent garbage collecting. Unless you're as stupid as the Minecraft developers you will rarely suffer from GC pressure with heaps below 10GB.