Thrakier said:Could you please elaborate on that? Is this a PJS issue or a general PS3 issue? If so - why?
Just a general network issue, not even ps3 related really - wi-fi has higher latency and lower data-rates than cable - especially if you multiply it by the possibility that the other person is also on wi-fi.
Other things to consider while playing online is stopping bit-torrent or any other download activities that your router might give priority to, sapping your latency and bandwidth. (latency can be sapped if packets are dropped due to other transfers going on/router being overloaded/etc)