> I cannot understand why Jetbrains keep the VM settings as constrained as they do. It's a big difference.

A lot of the things JetBrains does are questionable, particularly the way they write UI applications. One would expect from a company that spawned a widely used JVM language and a JVM IDE that they would know how to write responsive Java UIs, but apparently, they don't. They are doing some really weird stuff like mixing up Skia with Swing, it’s just a big mess. The worst part is that most people will end up thinking Java is the issue. Ironically, Microsoft has done the same to Visual Studio which is incredibly sluggish these days.