I am running Photo Mechanic Version 5.0, build 19094 (12cba6f) and I run Mac OS X 10.13.2 on my Intel-based iMac. (3.5 GHz Intel Core i7, 32 GB RAM, SSD)
I have a contact sheet open with a large number of RAW .NEF photos (usually several thousand) and I'm in the preview window rating my photos. Whenever I click off of Photo Mechanic, use any other application for a few seconds (such as a web browser to read my email) and come back to Photo Mechanic I have to wait for it to reload, which takes 2-3 minutes. I get a "Getting sort data..." message and can't do anything in the meantime until it's done reloading. It's a bit frustrating because nothing changes as far as my photos go or the folder they are in, all I do is go to another application and come back and have to wait a long time for Photo Mechanic to become responsive again. I should also mention that I order my photos by capture time.
Any way to fix this is greatly appreciated! Thank you!