I also had these problems with weak signal and bad performance with my
RTL8187 usb stick under Jaunty.

iwconfig also only showed 1Mb/s, even when I manually changed it to
something else.

On my DSL router I had WPA2 enabled (not both WPA & WPA2). But Wicd
could only do this combo (not sure at the moment about network manager,
but with network manager I had the same problem). So I installed this
addon from the site  www.elektronenblitz63.de (its German only
unfortunately) which adds the options for just WPA or just WPA2 under
Wicd. Using that, all of a sudden my link speed is up at 54Mb/s and
signal quality is up as well.

Hopefully this info is usefull.

-- 
realtek rtl8187 weak signal, occasional slow performance
https://bugs.launchpad.net/bugs/293946
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