torrents does require port forwarding for good performance .. AS said above use azuereus connection wizard to see if u get nat error .. Azuereus is a very good torrent client but only bad thing abt it is its memory usage (java :lookaround: ) so if u have good 256 mb or more ram then it should run very fine or u can use some lite torrent client like ziptorrent or bitcomet tooo .. but forward ports in ur router