Comment 7 for bug 763974

For what it's worth, the ath9k fix suggested here:
http://www.ubuntusecrets.it/2011/04/hack-connessione-lenta-su-natty-forse-ho-la-soluzione-giusta-per-voi/?lang=en

solved my problem. I'll check out the natty upgrade though.

Barry

sudo -s

echo "options ath9k nohwcrypt=1" > /etc/modprobe.d/ath9k.conf

reboot