You’re right that MMA is sluggish in the browser but hopefully that will be improved in the future like many websites services. GeoGebra and Desmos are great but just a bit too limited to capture the full expression of my imagination. As a teaching tool they’re probably more approachable for students of any age. I made the illustration myself, hence the inclusion of MMA. Thanks for your feedback though, I will try to draw them too sometime, something geometric?