Ya, my only issue with Deluge is after ~500 torrents it starts to slow. I’m on private trackers, so I always tend to have ~2,000 torrents seeding at once. For my particular usecase, it simply becomes too slow and bogged down to be viable.
Granted, I’ve not used Deluge in some 2 or 3 years; maybe they improved process handling since then? I’d love to be corrected if so.
If you do, I’d be interested to hear results. Deluge’s plugins are nice and it’s easy to make your own. If it wasn’t for the performance issues, I’d likely still be there.