I tried the current kernel for precise 3.2.0-26-generic with and without 
linux-backports-modules-cw-3.3-precise-generic on my lenovo s205 with RT3090 
chipset. 
The problem still exists. After some time wireless speed no longer exceeds 
approx 70KB/s.
While downloading data at this speed, the roundtrip to the access point 
increases drastically


64 bytes from 192.168.1.254: icmp_req=1025 ttl=64 time=1.34 ms
64 bytes from 192.168.1.254: icmp_req=1026 ttl=64 time=1.33 ms
64 bytes from 192.168.1.254: icmp_req=1027 ttl=64 time=2.12 ms
64 bytes from 192.168.1.254: icmp_req=1028 ttl=64 time=127 ms
64 bytes from 192.168.1.254: icmp_req=1029 ttl=64 time=500 ms
64 bytes from 192.168.1.254: icmp_req=1030 ttl=64 time=501 ms
64 bytes from 192.168.1.254: icmp_req=1031 ttl=64 time=479 ms
64 bytes from 192.168.1.254: icmp_req=1032 ttl=64 time=253 ms
64 bytes from 192.168.1.254: icmp_req=1033 ttl=64 time=894 ms
64 bytes from 192.168.1.254: icmp_req=1034 ttl=64 time=1472 ms
64 bytes from 192.168.1.254: icmp_req=1035 ttl=64 time=1718 ms
64 bytes from 192.168.1.254: icmp_req=1036 ttl=64 time=1952 ms
64 bytes from 192.168.1.254: icmp_req=1037 ttl=64 time=2266 ms
64 bytes from 192.168.1.254: icmp_req=1038 ttl=64 time=2567 ms
64 bytes from 192.168.1.254: icmp_req=1039 ttl=64 time=3319 ms
64 bytes from 192.168.1.254: icmp_req=1040 ttl=64 time=4639 ms
64 bytes from 192.168.1.254: icmp_req=1041 ttl=64 time=5066 ms
64 bytes from 192.168.1.254: icmp_req=1042 ttl=64 time=4938 ms

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

Title:
  RT3090 Network speed are very low with Oneiric.

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