>If you are viewing an image in one application and then >switching to a second application and find that the second >application views the image faster than the first application >then this is likely caused by the OS' unified disk cache >keeping the image file's contents in RAM, which loads into >another application's address space hundreds of times faster >than loading directly from disk. I would expect the first >application to also load the image faster if you quit it, >launched it again immediately and then loaded the same image >again.
I understand that, which is why I fired off a few new shots, and then tested the loading times for images that hadn't previously been viewed. With the large jpg test, I tried IView first and then FPV. IView was still the quickest by some distance, and much quicker than it had been previously.
I will add that I use Photo Mechanic 4 (I know, I need to buy 5!) routinely, every day, and I know how great it is.