one of them is using a Pando Media Booster downloader , its like a torrent client, while you play you will send datas to other ppl to download fast too.
If you are using torrent client for movies games etc, and you play a game througfh PANDO MEDIA BOOSTER you might lagg sometimes very bad.
You can uninstall or kill the PMB.exe process while you play . Better uninstall it . You can uninstall it if you want from Control Panel , Add or Remove Programs.
For more info or if you want a confirmation from what i said,or before do something , search in Google : "Perfect World International forum Pando Media Booster" . You will find A LOT posts in the PWI forums about PMB (pando media booster)
I think PWE will add a torrent client download to STO if they didnt done that already.