STOP USING WIRELESS CONNECTION for goodness sake!
Who the hell uses wireless to play online games? you use ETHERNET CABLE to play ONLINE GAMES!
freaking hell man and all these people complain about lag. Just because the almighty ps3 features wireless connection doesn't mean it is granted for you to use and play online. You use the wireless to use the internet browser, chat with friends, use the PSN store and other functions of the PS3.
However you use ETHERNET Connection cable to play games online!
data packets transferring with wireless comes in small bits therefore the game lags, with ethernet cable it can carry lots of packets.