Share your experience!
I my sony xperia arc s Internet slow often it is getting hanging. Most of them complaining Sony often gets hanging. even when we write are they taking into consideration or not.
Little bit tricky to understand what you mean I'm afraid, but is it that your Internet connection is slow or that the phone hangs that is the problem?
Try explaining a bit further and we'll try to sort it out. 
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First of all try clearing cookies,browser history and cache..do you use P2P (Peer to Peer) file sharing programs? If so then try turning the file sharing program off, as file sharing programs use up allot of bandwidth some broadband providers limit the speed you can use the internet if you are using file sharing programs.
If you turn off the file sharing program your broadband speed goes back to normal .
I faced the same problem ,after doing this i checked my speed from Scanmyspeed.com apparently my internet speed is faster than before