Recent GC algorithms slow down the application, either by not scheduling coroutines that allocate too much memory or by forcing them to do the marking or the evacuation (helping the GC) when running (or both).

With that, STW pause time does not depend on the heap size or on the root set size (the stack size). In practice, it means pause < 1ms, at that point the OS becomes the bottleneck, not the GC.

So latency is good but throughput can be reduced by 30%.