A possible fix:
# iw dev wlan0 set power_save off
This has made a WORLD of difference with my setup above. Now getting
full speed. I wasn't having the disconnect issue like others just the
slowness... my pings to google were around 120ms now 12ms ..
Someone should try this on a fresh install...
Good luck o/
# iwconfig
wlan0 IEEE 802.11bg ESSID:"edit"
Mode:Managed Frequency:2.412 GHz Access Point: 78:C5:B3:67:43:51
Bit Rate=54 Mb/s Tx-Power=20 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Encryption key:off
--> Power Management:off
Link Quality=70/70 Signal level=-38 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:17 Invalid misc:930 Missed beacon:0
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https://bugs.launchpad.net/bugs/1444226
Title:
[Kubuntu 15.04 beta] can't connect to wifi with Ralink RT2561/RT61 and
NetworkManager
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