Recomendo utilizar os seguintes argumentos de java:
-XX:+UseG1GC -Xmx6G -Xms4G -Dsun.rmi.dgc.server.gcInterval=2147483646 -XX:+UnlockExperimentalVMOptions -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=25 -XX:G1HeapRegionSize=32M