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...that performs so badly I'm getting like 4fps.

Sounds like your browser might not have GPU acceleration on. What frame rate do you get on https://webglsamples.org/aquarium/aquarium.html

Ah, yes! You are correct. Fixing that fixed the game, and bumped fps on that example up from 25 to 100.

Thanks!

I'm getting better than that on a cheap laptop with integrated graphics. What system are you seeing that on?