My image got unresponsive for a long time just at the end of load, showing the dialog 2 new update file(s) processed Attaching gdb to the process and call printAllStacks() gave me: 2033300892 WeakIdentityKeyDictionary>scanForNil: 2033132772 WeakKeyDictionary>rehash 2033128872 WeakKeyDictionary>finalizeValues 2033128780 >finalizationProcess 2033128688 SequenceableCollection>do: 2033128580 >finalizationProcess 2033128488 Semaphore>critical:ifError: 2033128396 BlockClosure>on:do: 2033128284 BlockClosure>ifError: 2033128152 Semaphore>critical:ifError: 2033128060 Semaphore>critical: 2033127968 BlockClosure>ensure: 2033127820 Semaphore>critical: 2033127684 Semaphore>critical:ifError: 2017849452 >finalizationProcess 2017849360 >restartFinalizationProcess 2017849544 BlockClosure>newProcess And this loop did last very long... Of course, this is a high priority process, so pressing ALT+. won't give me much feedback. Hmm, a high priority process taking CPU for a long time, that smells...