[shmde]

"The React style forces a lot more object creation and copying then you're probably imagining."

Its not react style its literally the core of how react works(immutablity). To rerender a component you need the new state to point towards a new reference to an object/array (hence the copying data to a new array) because JS compares objects/arrays through reference and not value. Not exactly react's fault but how JS works.

[nitwit005]

I said "react style" because they are not using React in a conventional way: https://github.com/kevzettler/react-regl