As the subject line says, PM has ceased to be a speed daemon. Applying star ratings or deleting files usually takes several seconds (usually around 5 seconds per photo) and brings forth the dreaded beach ball. This has made PM all but unusable for me for file browsing and sorting. It's about as slow as Lightroom 6, and much slower than Capture One 9. This is the case both when browsing files on an internal SSD and internal 7200rpm 1GB drive in my 2010 Macpro tower using Photo Mechanic Version 5.0, build 17146 (60130ac). The same held true for the previous build I was using. Running OS X 10.11.3. My Mac has 32GB of RAM, so lack of memory shouldn't be the cause.