Everytime I give focus back to SourceTree (after working in another app) it hangs for over 30 seconds. I noticed this initially with an older version. I updated to 2.0.19.1 and the problem seem to go away. Yesterday morning I updated to 2.0.20.1 and have been experiencing the problem ever since. Its extremely frustrating. I'm on Windows 10. While I'm working in SourceTree there are no performance issues, everything works nicely.
I have looked at other posts regarding performance but none seem to mention this particular problem.