Slow USB3 harddrive slow performance

Hi,

I have a USB 3 harddrive connected to USB 3 port of the computer running 13.1. I did bendmark with Bonnie++ and it looks slow (screenshot is here).

I also did a simply copy and paste from external usb harddrive to internal harddrive, it took about 2 min to copy 8GB file. My expectation is at least 100MBps speed for USB3.

Any suggestions?

/S