Same here. I just upgrade to final 11.10 release, and the wireless is
really slow.

$ uname -a
Linux cagliari 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:56:25 UTC 2011 
x86_64 x86_64 x86_64 GNU/Linux

$ lspci  | grep -i network
02:00.0 Network controller: Intel Corporation Centrino Advanced-N 6200 (rev 35)

$ sudo ethtool -i wlan2
driver: iwlagn
version: 3.0.0-12-generic
firmware-version: 9.221.4.1 build 25532
bus-info: 0000:02:00.0

The wired connection is ok.
Using an external USB Linksys WUSB100 v2 RangePlus Wireless Network Adapter 
[Ralink RT3070] is also ok.

The workaround solves this issue (but disabling N support).

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https://bugs.launchpad.net/bugs/871254

Title:
  iwlagn module in 11.10 beta2

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