Very slow wireless internet when running on AC power

Since installing Leopard (and then updated to 10.5.5), I have been having really incredibly slow wireless internet access - however it is only like this when the AC power cable is plugged in. If I pull the power lead out and work on the battery, then the internet starts working again almost immediately. The airport signal isn't lost at any point, so I am a bit confused.
I have reset the PRAM, entered new DNS servers (opendns.org ones) and even set my RWIN lower as described here: http://discussions.apple.com/thread.jspa?messageID=5670430 but with no noticeable result.
My macbook pro is 2.33ghz Core 2 duo. I'm using a Belkin n1 router with WEP encryption. The idea that the power supply would affect my wireless internet like this seems really bizarre. I would be grateful if anyone has any idea what could be going on here.

Well l.e.o, since no one else is taking a stab: check your System Preferences > Hardware > Energy Saver settings. See if Settings for Power Adapter, Optimization, is not set for "Better Performance." It may be set for "Better Energy Savings," and the settings for Battery are set to Optimized for Better Performance?

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