I haven’t used IntelliJ, only Android Studio which I know is based on IntelliJ but don’t know how much they differ. I find it to be a klunky UI and it easily eats all the CPU on a 2015 3.1 GHz MBP doing things like self-updating, downloading newer SDK versions, re-indexing a small repo, etc. I personally find it pretty unusable. There’s also parts of the UI you can’t even access (like the SDK manager and the AVD manager) unless you have a project open. It’s pretty obviously not a Mac native tool. I assume (hope anyway) it’s much better on Linux.