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Thanks for the advice. I'm stuck on 11 until the next LTS release but I'll definitely be trying ZGC next year. (ZGC is in 11 but still marked experimental, and I'm conservative about making changes.)

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That's probably a good decision. When ZGC was first released it didn't support class unloading, including in 11. This will lead to puzzling memory leaks in applications that generate a lot of code at runtime.

Newer versions of ZGC support class unloading and have some other performance optimizations

Shenandoah might help you. See my other comment for more details:

https://news.ycombinator.com/item?id=24571054

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