I haven't tried this yet still waiting for the delivery of my Catweasel MK4 from Amikit.
If running Win XP it can be very funny about Floppy drives, even writing to a standard 1.44MB FDD is slow compared to Win 9X and Win 2K.
My suggestion is to use a seperate FDD connected to the MK4 Controller and just use this drive for Amiga use.
Shaf