Because your motor is spinning faster at higher speeds causing higher rpm's
A high-speed USB (2.0) has a raw data rate at 480Mbps, and it is rated 40 times faster than 1.1.
The high speed trains of Japan will nudge 200 mph.
Around 480 MBps, It varies upon whether or not the port the USB is inserted in is a high-speed hub, and how much processing power the computer has.
2mbps to 8mbps