Its actually extremely fast - quite the contrary.
Don't use the USB that is displayed in Linx - use the Virtual Backplane option - it will automatically populate your USB connected devices - the USB that is shown in the tree seldom works in my experience
I use this very often - the initial connection takes up to 30 seconds to illustrate - it also seems to lock up linx at the same time - be patient - once it is illustrated, you can drill into the processor/backplane