個網好慢

我用緊Netvigator 30mb,用緊d-link router,又有用到bitcomet downlaod野,之前一路都冇事...但係唔舍點解呢排一開個bitcomet download野....個網就慢到完全用唔到....唔知有冇咩辦法可以整番好.....port forwarding唔知有冇用呢....同埋d-link router o既port forwarding點set呢?我而家用緊d-link dir-655 o既wireless router,請大家幫下我呀,唔該晒各位兄弟~