Hello LukasWho!
There isn't much room for optimization - it's merely that the visual effects are quite expensive. I wanted to add performance settings but no time. If I went ahead with this I'd add options to disable MeshPhysicalMaterials, SSAO, and Bloom. I don't think webpack would help with anything but loading times.
Good ideas for UX improvements. Dragging is defo good and i could have probably made those customer orders a little bigger.
Thank you so much for the detailed feedback!