Hello Ron,
Using PhD4, I often load folders of RAW images & haven't noticed any "slowness" compared with similar software.
I just imported 10 NEF (36MP) files from a Nikon D800 & it took just over 7 seconds. It did take a further 13 seconds for the thumbnails to render completely. Importing the same 10 shots in JPG format was mucch quicker (of course).
Repeating the time test in LR gave similar results, though thumbnail rendering was quicker).
My PC has only modest specs: i7 CPU 920 @ 2.67GHz, GTX 260, 8GB RAM. It would be useful if you post your PC's specs, as Steve suggested.
PIX
PIX YouTube channel