This has not been done in the most optimal way—it could do with a lot less JS being used. A version with (mostly) WebGL could be much less resource hungry. Try

This has not been done in the most optimal way—it could do with a lot less JS being used. A version with (mostly) WebGL could be much less resource hungry. Try this version for comparison: https://codepen.io/stefanweck/pen/Vbgeax https://codepen.io/stefanweck/pen/Vbgeax