A modern programming language that makes developers happier.

kotlinlang

I'll say I've seen a lot of exceptions in the Kotlin plugin since forever, unfortunately. There seems to be some systematic issue where JB don't really fix them at the rate they're introduced. *However* this may be because they often don't seem to affect the actual user experience. I have 16GB of RAM on a typical MacBook Pro, and I don't see performance problems or any serious bugs when using Kotlin. Seeing 30 second+ freezes is totally wrong, that sounds a lot like IntelliJ has been given a fixed RAM limit. Look in the logs (reachable via Help) to see, or alternatively, do what I do and change the JVM parameters to let it use more memory and switch to G1GC. This will give you way better GC pauses and especially if you're stalling due to GC thrashing it should fix it. I always make this change as otherwise, it's true, IntelliJ can die horribly in ways that are hard to figure out because its been RAM limited for no reason.