I used to use it for Scala, sometimes the editor would hang for 30-40s (probably even more but I don't want to sound like I'm exagerating.) I moved back to Emacs+Metals which suits me better (it's hard to leave Emacs after 20+ years of use.)

Nevertheless I still think Intellij is an awesome piece of software and I still start it sometimes to get useful features which are not available in Metals, like inline type annotations for long method chains (really useful when coding with Cats) or "show implicit hints" to see which implicits are used / missing and where.)