Win 7 Pro. Updated.

USB3 flash pen drive with 20G of data to copy.

Plugged into a USB3 (blue) port on Win 7 desktop.

Coping to a 8T NAS on my home LAN. Plenty of space on the NAS.

After One Day 11 Hours it says it still has 8 Hours left to complete copy.

Win 7 PC is wifi connected on 5GHz channel.

Router is AT&T wifi and internet connection 1Gbits.

NAS is CAT5 to Router.

Why so slow ?