On os x, Transmission is a hog, but it has brain dead features like actually letting me decide where my files should be downloaded when opening a torrent, instead of just one folder.
I am using utorrent though for my private trackers, which involves opening preferences each time before I add a file, and picking a download location. It runs like a champ though, even with 125 torrents. Transmission becomes sluggish with just 20 for me.
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