[kaba0]

Depends on when. If we are talking about modern day JVM, than even the non-latency optimized default GC would have <10ms stop-the-world pauses for up to gigantic allocation rates, much less for the presumably minor one of a simple game. And then there are two latency optimized ones, Shenandoah and ZGC, with the latter having <1ms, meaning that your OS introduces more latency with thread switches.

So I think writing a game while profiling allocation rates and paying a bit of attention to not spam new everywhere, one should get decent performance without any framedrops. At most, optimize the hot loops with primitives, arrays.