Logs: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1103314 iwlwifi is abyssmally slow in 3.8 compared to 3.7 3.7: 84Mbps/40 3.8: 3Mbps/1 Workaround is loading iwlwifi with the 11n_disabled flag set at 1
please retry on 3.14 - there is a W/A that should help there