1000% agree. I am disappointed [1] with JetBrains' attitude to this problem. They seem to judge anyone who isn't using the JDK11-based JBR in 2020 as a difficult customer, and do not acknowledge latency/lagging problems on Linux. Mac users then reply to threads like this saying "works on my computer flawlessly, I don't know what you're talking about", until they confess to being Mac users.

I have tried JAOTC up until JDK16 with some IntelliJ products, but I think you are right in saying that the single most effective knob (or two) to twiddle in the default installation is to enable ZGC and increase the heap size.

Yes, I know JBR provide DCEVM builds (which need to be enabled by downloading the JDK and changing the "boot java" setting, ironically)

[1] and by that I mean "fuming"