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Wow! Great research here. I wonder if you enable incremental mode for the concurrent mark sweep GC using -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode how that would work. Also, the concurrent collector uses additional cores to do the work, so might not work so well unless there are cores free. Of course, designing a bot so that it is resistant to skipped turns, and uses little CPU and memory, is probably the most important aspect of all.