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For video games it is pretty bad, because reading back a page from disk containing "freed" (from the application perspective, but not returned to the OS) junk you don't care about is significantly slower than the OS just handing you a fresh one. A 10-20ms delay is a noticeable stutter and even on an SSD that's only a handful of round-trips.

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Games today should be using ZGC.

There's a lot of bad tuning guides for minecraft that should be completely ignored and thrown in the trash. The only GC setting you need for it is `-XX:+UseZGC`

For example, a number of the minecraft golden guides I've seen will suggest things like setting pause targets but also survivor space sizes. The thing is, the pause target is disabled when you start playing with survivor space sizes.

Overall if java hits the swap, it's a bad case. Windows is a like special beast when it comes to 'swapping', even if you don't truly needed it. On linux all (server) services run with swapoff.

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