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When I auto import one class (yes, I know Fix Imports is there, but Alt-Shift-I is habit - and faster if you know you only have one thing to import - and also works on broken source files that Fix Imports won't), typically after I press OK, the UI is frozen with the dialog still there for 30 to 60 seconds; at minimum there should be a wait cursor, but it probably also shouldn't be so slow.
That's definitelly weird. I do not experience this behavior. What build are you using? Do you see anything in the messages.log file? Could you please attach it? This kind of delays is usually caused by MDR rollbacks...
Conceivably mac-specific. Milos, do you see this too on your mac? I haven't seen any stack traces. I'll try to get some thread dumps.
Closing as works-for-me. Please reopen if you have more information (steps how to reproduce it, thread dumps, etc.)