Slow wireless about 1/3 bandwidth of wired from cable modem

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http://askubuntu.com – HP DV6000 Wireless G Broadcom Netgear WNDR3400 router properly configured. Windows laptops using wireless G and N are considerably faster than mine. 12.04 LTS, all restricted drivers and all up to date. 50Mbps wired and 9-21 Mbps wireless on Ubuntu. (HowTos)