[tripzilch]

Odd. Here on Firefox/Linux using an underpowered laptop and 1080p monitor (indeed not the most optimal set up, but it's what I got right now), I expect most animations on modern websites to be janky.

But Sortable is completely smooth for me, yet Dragula lags or stutters a little.

I really wonder what the difference is?

I do have to say, even though they were slower, Dragula's drag-n-drop felt more "solid", in a way. Though I would guess that's some subtle clever placement tweaks, nothing that should affect performance.