The torrent from thepiratebay.org does not work well with tornado because the tracker doesn't respond quickly like other tracker that takes only seconds.
The great lag is caused by overused of their bandwidth due to the amount of peers on it.
Are you familiar with this tracker?
http://tracker.prq.to/announce
You can never connect with tornado in an instance, you'll have to wait 5-10min
that's a long time to wait.
only thepiratebay site can do scrape with this tracker because it is queued or it can cause its integrated into their website.
DHT allows users to connect to each other even without any tracker but is a little slower. The cost is a little bandwidth from each of us resulting in 5-10 percent slower download. That's why some do not like dht as it is bandwidth hog for everyone.
A small price to pay imho and well worth its weight in gold