Comment 105 for bug 124159

Just copy/paste the following statements *once* line by line to a console/terminal:

sudo su
echo -e '#!/bin/sh\niwconfig eth1 rate 5.5M auto' > /etc/network/if-pre-up.d/fixed-rate
echo -e '#!/bin/sh\niwconfig eth1 rate 5.5M auto' > /etc/network/if-up.d/fixed-rate
exit

Now disable/enable your wireless network or reboot to see the effect. Works for me.
This setting makes that your bcm will max out at 5.5M and go even lower if necessary.

Replace eth1 with your actual netwerk interface.

Peter