JDK 16 is out, and as usual, each new release comes with a bunch of new features, enhancements and bug fixes. ZGC received 46 enhancements and 25 bug fixes. Here I’ll cover a few of the more interesting enhancements. Sub-milliseond Max Pause Times (a.k.a. Concurrent Thread-Stack Processing) When we started the ZGC project, our goal was to never have a GC pause take longer than 10ms. At the time, 1