Confirmed. I have a netbook Samsung N-150 with dual-boot W7 / 12.04.  When the 
signal is weak (far away), and the link dies - and mostly does not even 
authenticate any longer - I can browse the net reliably by booting to W7.  Same 
position, same hardware, same access point. 
Driver ath9k.

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https://bugs.launchpad.net/bugs/975316

Title:
  wifi network performance degrades awfully where other OSes work just
  fine

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