Faster CPU does not eliminate GC pauses if your workload consumes a large amount of RAM. This is one of the other benefits which Zing provides.
[0]http://www.cakesolutions.net/teamblogs/low-pause-gc-on-the-j...
Shoutout to the Azul guys, Simon, Elaine and Paul for coming on-site and watch me compile all their extensions on Amazon Linux and help me perform all the testing.