Author here, thanks for the feedback =) That laggyness is most likely the demo's fault, not the library's. The demo uses CSS transitions to animate the height of the container, which is very bad for animation performance (shame on me).
Do you mean jQuery UI resizable? In any case it should be very easy to add item resizing functionality to Muuri using jQuery UI resizable or similar library. Actually the easiest way would be just using hammer.js, which is one of the two dependencies of Muuri. I'm in the process of creating a few extra demos to demonstrate Muuri's capabilities a bit more so I'll keep this idea in mind for the demos.
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[ 0.20 ms ] story [ 18.1 ms ] threadLooks great!
[0]. Kanban Demo