A major caveat is, it's still JavaScript so the performance vary according to the browser apart from other variables.

Benchmark on iPad Air 2 iOS 10.3.2 is close for both chrome and safari.

Safari

CPU: 6.110s ±1.9% GPU: 0.487s ±1.0% (12.55 times faster!)

Chrome 59

CPU: 4.454s ±51.8% GPU: 0.483s ±0.9% (9.22 times faster!)

Project looks promising though, congratulations to the team.