^not necessarily . . .
what happens usually is that when a person allots 100% of upload speed on the torrents/P2P , the download speed for the same torrent is not affected .. but browsing is affected because the browser cant submit the content(website urls/id /pass) etc , because the P2P will be taking the 1st priority.
So It is RECOMMENDED to allot ~75/85% of upload speed to p2p apps so tat it dont affect the download speed of other connections ( browsers).
Correct me if im wrong.