These are the basic principles of optimizing a bittorrent client, like BitComet, for speed:
- Choose a proper port to avoid ISP blocks and conflicts with other programs
- Forward that port through any software firewall and router to allow incoming connections
- Adjust internal settings based upon upload capacity of the internet connection to allow room for outgoing communications and to distribute upload efficiently.
Optimizing BitComet for Speed
http://www.techsupportalert.com/content/optimizing-bitcomet-speed.htm