NIOEventLoop and high cpu usage

[pturmel]

Also, switch to G1GC. The concurrent-mark-sweep garbage collector is horrible. Start here:

Migrating to Java G1GC garbage collection

Oracle backed out of its announced rollout of G1GC as the default in Java 8. It supposedly is the default finally in Java 9, but I haven’t switch to 9 yet. Adding the switches won’t hurt anything if its the default.