Wireless Internet Connection so slow after upgrade to 11.10
Same issue here with network controller: Intel Corporation WiFi Link 5100 Everything was working perfectly with previous versions of Ubuntu but after updating from Natty 11.04 to Oneiric 11.10 the problems with N-Channel started.
The following commands solved the problem.
sudo rmmod iwlagn sudo modprobe iwlagn 11n_disable=1
Try browsing again and if there is an improvement, make this change permanent by creating an 'options' file:
gksu gedit /etc/modprobe.d/options.confand add the line
options iwlagn 11n_disable=1
Hope this will help.