[lbebber]

This effect uses both WebGL and canvas 2d. I'd guess that for some reason the canvas 2d isn't using hardware acceleration on those browsers?

Somebody has made a version using WebGL alone[1] (sadly they got the refraction a bit wrong), try it to see if it works well enough (and let me know, I'm curious myself).

[1] https://codepen.io/stefanweck/pen/Vbgeax

[kossTKR]

Interesting. Speed is still about 40% in Safari and 60% FF compared to Chrome with this version. Much better than the 2d-canvas version though and looks pretty fluid.

Would be pretty weird if the osx native browser didn't hardware accelerate while Chrome does it on a MPB, but Apple are often weird like that.