The topic is incremental garbage collection. If you include this option to startup IntelliJ will too slow. Garbage collection be in incremental (recursive) defragmentation. It's no good idea for IDEA. If you want reduce times of GC runing, try:
-Xms96m -Xmx128m
As usual ideal less that 59 megs. If memmory value was more that -Xms garbage collector may be run. Garbage collection run every time then memory come to next maximum memory point. For example. Run IntelliJ and see at right bottom coner - the digit of status maximum - is next max. memmoty point. Then JMV grow to this point gc run. So this point begin with -Xms - minimum of JMV memory and if you set this property to big value - it's mean that gc run not freaquncy.
PS. Sorry for pure English
