I have been using Photo Mechanic for a long time, for commercial work or anyone with 10's of thousands of images, especially jpg's, it used to be blazing fast, the fastest jpg thumbnail maker on the planet. I'm finding a lot of bugs and erratic behavior, not so much for jpgs, which it excels at, but tifs and psd's which take longer to read. I just accessed a 150mb psd file, Photo Mechanic took 2 minutes to render a thumbnail. With large format film scans going from 50mb to 250mb depending on size and resolution, image processing speed is important. Wondering what you use if you have a large collection of large (and small and medium but mostly large) files to fling.