I am evaluating PM and I am impressed by the performance of the software as well as the support provided in these forums.
Theres is however one operation where speed is far from impressive, and unfortunately it is in the middle of my typical workflow. When I import images from the camera(s), I put them in a directory structure which look like this:
\Photo\070710-Title\Cameraname\
I then browse this folder (with PM or some alternative) to find the "winners" which I drag-n-drop into the parent folder (070710-Title). The problem is that in PM, this drag-n-drop takes a long time (5-10 seconds) which is really frustrating. The number of images in the folder seem to affect the performance and in my case it is ofter several hundred and occasionally over a thousand images. Doing the same operation in Windows explorer takes only a fraction of a second!
I am using PM 4.5.1.1 on Windows Vista 64-bit. The images I work on are Nikon NEF files.