set "JAVA_OPTS=%JAVA_OPTS% -XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled"
   set "JAVA_OPTS=%JAVA_OPTS% -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSInitiatingOccupancyFraction=70"
   set "JAVA_OPTS=%JAVA_OPTS% -XX:+ScavengeBeforeFullGC -XX:+CMSScavengeBeforeRemark" 

bajo la línea set "JAVA_OPTS=-Xms8g -Xmx16g -XX:MaxPermSize=1024m" o similar.