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While not as beautiful, your library is a lot more performant to be sure. After throttling my CPU by 6x, everything still felt really smooth with interactjs, while Shopify's lib began to choke. There are pretty big differences though. Shopify offers swapping and sorting, and even supports feature like force touch.

How do both of these compare with https://github.com/bevacqua/dragula ?

Dragula was great but maybe it's suffering from developer fatigue : https://github.com/bevacqua/dragula/pull/448#issuecomment-32...

This works much better in my Android phone (Nexus 5 with chrome dev) than the OP

Your example is not running smooth for me, it has a slight delay when moving elements.

Any chance you know if interactjs works properly with shadow DOM?

No idea, sorry.