The USB external drive concept introduced in the NewViews 2.08 Manual under How How to make NewViews run faster explains the difference between accessing the disk randomly vs. sequentially.

If a machine comes installed with the Microsoft default hard disk drivers, accessing the disk will be adequate for opening word documents, spreadsheets, sound files and etc but the performanace will be very slow for a disk intensive application like NV2.

Install the correct hard disk drivers from the manufacters web site and you should see better performanace without moving to a USB drive.