u-Link NT,USB JTAG NT SPI flash read speed.

Under USB 3.0 port and USB 2.0 port with USB 2.0 and USB 1.1 hubs.
u-Link NT works best on USB 3.0 port.
u-Link NT works best with a USB 2.0 hub on USB 2.0 port.
USB JTAG NT works the same on USB 3.0 or USB 2.0 port. It reads about half the speed if USB 1.1 hub is used.

u-Link NT USB JTAG NT
USB 2.0 Port Direct 873.94KB/s 932.01KB/s
USB 2.0 Hub 946.88KB/s 931.37KB/s
USB 1.1 Hub 871.29KB/s 472.41KB/s
USB 3.0 Port Direct 1012.99KB/s 931.69KB/s
USB 2.0 Hub 1012.96KB/s 932.69KB/s
USB 1.1 Hub 1012.44KB/s 505.64KB/s