But the per-process gc is pretty slow, and stw pauses are still proportional to the size of the working set in that process. If you have a multi-gb data-set you

But the per-process gc is pretty slow, and stw pauses are still proportional to the size of the working set in that process. If you have a multi-gb data-set you have to choose between a single process with long pauses, or spreading the data across multiple processes and paying for copying, locking and cache contention. Not to mention the extra code complexity of speading operations on single data-structure across multiple asynchronous sections. In many cases, for large working sets you're still better off with one the JVM GCs.