I have a TP-LINK TL-WN722N wi-fi adapter, and I suffer from bad connection quality on ubuntu. Dowload speeds may vary from 3 MB/s down to 40 kB/s, ping is unstable a online games are unplayable. On windows it works flawlessly. Any ideas, what may cause the problem?
Found a workaround, I used Windows Wireless Drivers tool https://apps.ubuntu.com/cat/applications/precise/ndisgtk/
I used windows xp x64 driver, works fine.