Hey there!
Ever since updating to 1.2.0, I seem to notice a degrade on the listview's update performance. It now takes almost 3 seconds to update the list of torrents after selecting a new category. I had never noticed this behaviour before 1.2.0 and since updating I must have added only about a dozen of torrents so I don't think that's the issue.
What can I do to help or is this expected for 130+ torrents active on deluge?