In my experience, IDEA becomes GC bound quite readily during indexing which in combination with indexing blocking most operations stalls the UI. It's not that

In my experience, IDEA becomes GC bound quite readily during indexing which in combination with indexing blocking most operations stalls the UI. It's not that the IDE OOMs, it's that it burns cpu cleaning up objects in stop the world collections. These stop the world events can be mitigated with additional memory.