Yeah, I feel the same: this looks really impressive and I would love to explore it, but it basically freezes any browser I throw at it. My laptop is a few years old but it's still quite a beefy one so that really shouldn't happen.
I get the impression it's trying to load the whole thing with all examples at once. Maybe it would make sense to refactor the various sketches into smaller ones so it doesn't try to load, run and render everything at the same time? That or introduce more lazy-loading features.