Centrino Wireless-N 1000 poor performance on N Network
Solution 1:
Well Yes I have another solution, perhaps it could fits to your problem or not. I tried the same solution disabling the N network mode, it works but it turns out not to work under N wireless network.
In my case, I was under a WEP encrypted wireless network, this was the reason why I was navigating to slow, with N mode enabled.
Just enable your N wireless mode and change your security wireless network to WPA2 , it will resolve your problem.
regards!
Solution 2:
Running 12.04 LTS using a Centrino Advanced-N 6200 wireless card. This solution work for me as well. Not thrilled I can't run N, but at least when I use other wireless hotspots I can at least connect. Edit /etc/modprobe.d/iwlwifi.conf
options iwlwifi 11n_disable=1