Here's a better workaround:

Download the patch that I am attaching to this comment. Then copy the
wireless power script into /etc, and apply my patch to it:

$ sudo cp /usr/lib/pm-utils/power.d/wireless /etc/pm/power.d/wireless
$ sudo patch /etc/pm/power.d/wireless < PATCHFILE

Putting a script in /etc/pm will override the script with the same name
in /usr/lib/pm-utils. The patch adds a special case for the "wl" driver
that prevents the activation of power saving.

Someone could add this patch to the source package and build a pm-utils
deb with the fixed wireless script in it if they wanted to.

** Patch added: "pmutils-fix-bcmwl-battery-slowdown.patch"
   
https://bugs.launchpad.net/ubuntu/+source/bcmwl/+bug/651008/+attachment/2615453/+files/pmutils-fix-bcmwl-battery-slowdown.patch

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https://bugs.launchpad.net/bugs/651008

Title:
  Regression in wireless performance under Maverick when on battery
  power (broadcom)

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