Yes loading of all filters (apart from Fast and slow) can take sometime.
You could always try loading back an earlier version of software and see if you can hear differences in the filters - but the fact its taking time to load the filters suggest that everything is working OK...
V0.90
https://dl.dropbox.com/u/86116171/mdac v0.90.exe
If you cannot, then I would suggest that a component in your audio system is limiting your system performance - what amplifier / Speakers are you using?
I have experienced systems in the past that "limit" the resolution to such a degree that its hard to tell differences which are blinding obvious in other systems - speakers are are common cause.
Oddly enough - I find QUAD ESL 63 (and later derivatives) to be guilty of this to a certain degree. They have a certain amount of resolution, but beyond a certain stage I find it hard to tell differences... I find the earlier ESL57 are much more revealing.
The Martin Logan CLSIIz I use are in a totally different class altogether...
John