Refraction is not as expensive as people would led you to believe. That said, this demo is ran at a very low resolution. Probably because it doesn't take device

Refraction is not as expensive as people would led you to believe. That said, this demo is ran at a very low resolution. Probably because it doesn't take devicePixelRatio into account. On my phone that's 3.5 so more than 12 times less pixels than would be required if you want crisp UI.