Comment 389 for bug 621265

Workaround #372 worked for me as well. No more speed drops since then. Big thx to Simon and his source.

Just a little note. If you have your wireless network with hidden SSID, it can take long time to connect to the network after being disconnected (long time means ~25mins, at least in my case).

info

lspci -vnn |grep -A3 Wireless
02:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection [8086:4222] (rev 02)
 Subsystem: Intel Corporation PRO/Wireless 3945ABG Network Connection [8086:1001]
 Flags: bus master, fast devsel, latency 0, IRQ 43
 Memory at fdfff000 (32-bit, non-prefetchable) [size=4K]
 Capabilities: <access denied>

uname -a
Linux manronF3F 3.2.0-17-generic-pae #27-Ubuntu SMP Fri Feb 24 15:59:25 UTC 2012 i686 i686 i386 GNU/Linux

lsb_release -rd
Description: Ubuntu precise (development branch)
Release: 12.04