Incessant timeouts; slow performance overall

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On Ubuntu, my /etc/defaults/tomcat8 changed from:

JAVA_OPTS="-Djava.awt.headless=true -Xmx512m -XX:MaxPermSize=196m -XX:+UseParallelGC -XX:MaxGCPauseMillis=100 -Dfile.encoding=utf-8"

To:

JAVA_OPTS="-server -Xms800m -Xmx1600m -XX:MaxPermSize=222m -Dfile.encoding=utf-8 -Djava.awt.headless=true -XX:+UseParallelGC -XX:MaxGCPauseMillis=100

Those changes seem to have been the difference between crashing / hanging all the time and not. So, relatively important changes.