I used a transmission-gtk, but it turned out to be a problem with a graphical interface. He simply did not respond when the number of torrents over 1000.
Then I tried the deluge. He worked quickly, but when the number of torrents over 2000, it did not react to button presses, and after reboot has lost about 500 torrents.
Please, advise me torrent client which is deprived of such a bug. Tell about the details of the settings ...