uk9089,
upgrade to the latest firmware if possible (AsusWRT).
Goto the "Traffic Manager"
Traffice Manager QoS = On (automatic mode)
Upload & download set to your internet packages speed (5,10,20Mb/s etc)

User defined QoS rules
service name: PC-heavyusage01
Source IP or MAC = Key in the PC MAC Address
destination port = blank
Protocol = TCP/UDP
Transfer = 0-256KB/s
Priority = Lowest

User-defined priorities
Lowest for both upload & download , min & max = 2% to 10%

This post has been edited by ldragon: Nov 18 2013, 10:57 AM

yaso1608, sure can update the firmware. It will add more features.