It is absolutely awful by default; IntelliJ apps are slow to the point of being unusable out of the box. The good news is that it is easily fixed (at least for my use case). I have tinkered a bit and running them on JDK16 or later, with JATOC has been a life-saver for me the past year, and reduced my paying subscription to an act of charity.

"Develop with pleasure" is well and truly dead until they make the out-of-box experience FAST.