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Strangely in our workloads we have noticed generational ZGC latencies are better than G1 at ~99th-99.9th percentile or below but worse at percentiles above that. The allocation rate is moderate.

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Above that you might easily get measuring artifacts, like the OS swapping out your process once, or so.

Yes - but it's quite consistent. If it was 'noise' it wouldn't be.

It can be easy to game metrics like this -- trading off p100 for p99.9 or p99. E.g., defer all the expensive work to 1 in every 10,000 operations.

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