How to reproduce:
1. Open the attached project
2. Select Unity Support -> "Create 100 x 100Mb Text Files" from the top menus
3. Select "create files" from the window that opens
4. Wait (several minutes) for the files to be created and imported
5. At this point the Asset folder should contain a sub folder, named "0", containing 100 .txt files of 100Mb in size each
6. Close the project
7. Delete the Library folder for this unity project
8. Open the Unity project again
9. Observe that Unity is unresponsive for a number of seconds, with no progress bar before the progress bar appears showing the .txt assets being imported.
10. Open the Editor log an search for "Hashing assets ... X.XX seconds " to check that the X.XX appears to match the time that Unity was unresponsive.

Expected: it is important that Unity correctly reports what it is doing so customers know that Unity has not crashed and can instead can try and optimize their computer configuration in order to bring the hashing time down if it's excessive

Fix: Progress bar says "Calculating asset hashes...", some stats are printed in log