I'm getting 12/0.5 Mb/s dl/ul from my ISP, so it's close to the overhead ratio of 20:1 that you've mentioned earlier. That's what I meant, not that it's my ISP fault. The seeder client was listed as libtorrent 0.11.9, so it seems that + small pieces are the culprit in that case. I never suspected that overhead can reach such values. Thanks for the info.