Another one: There's something horribly un-optimized going on when I click and drag some values to a new location. Even when there's no overlap, dragging a tin

Another one: There's something horribly un-optimized going on when I click and drag some values to a new location. Even when there's no overlap, dragging a tiny number of values, like say 3, ends up hanging for several seconds on my very fast computer. I remember this also didn't used to happen back ~2011-2013 ish, and then I remember it started happening at some point and hasn't been fixed since.