I've Lenovo S205 with the same wireless chipset and experiencing the same 
problem. 
A few days ago I upgraded to the current dev version of quantal, running kernel 
3.5.0-16-generic.
The low speed problem seems to be gone.
I tried it over a longer time and across suspend an resume cycles in a 802.11g 
network.
Using scp, I copied a larger file reaching about 2.6MB/s contiuously, several 
times.
Looks fine now!

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https://bugs.launchpad.net/bugs/896582

Title:
  1814:3090 RT3090 Network speed are very low

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