I dont expect always high speed but if i have 15 and normally 240Nitemare said:In BitComet, choose preferences.
Put the upload to something like 10 to 20 (any digit in that area...15, for instance). Then just put your download to something like 200. Should help out.
There's various other things to consider, like the health of a torrent (seeders and downloaders)...blah blah. Bottom line: don't always expect high speeds.