I ran out of room in the comment…
grawity: It matters very little how many peers you access, and it doesn't matter at all how many ports you use. Ports are simply connection markers; the real speed limit comes from your hardware and your ISP's plan.
Pacerier: @grawity could youj explain why it matters very little how many peers we have access to?
If your software and/or hardware and/or ISP limit the number of connections, then it won’t make a difference if there are more peers than you can connect to.
Look at the peers and seeds numbers in the clients. They will usually be of the form
x (y) , where x=number of clients you are connected to and y=number of clients in that swarm. Usually, you will find that
x < y.
The number of peers matters only insofar as the availability of the torrent (more peers and/or seeds means more sources which generally means faster transfer, but only up to your limit). It has little bearing if for example one or two peers are maxing out your Internet connection speed or you are already connected to the maximum number your software/hardware/connection support.
You can adjust the number of connections in the torrent client’s settings, but setting it too high will only cause problems because your operating system has it’s own limits (vis XP SP2), as does your hardware (for example, consumer-grade routers can crash when overloaded with connections), and of course your ISP can (does?) slap a hard absolute limit on the number of connections you can have, not to mention using it as a P2P detection heuristic to start throttling and so on.