You're missing the point he's making. Preact is leaner than react. FF was leaner than mozilla.
React isn't slow (yet?), but it's not hitting any universal limits, there's always scope for leaner, smaller and faster software (yes it is, see benchmark).
React isn't slow (yet?), but it's not hitting any universal limits, there's always scope for leaner, smaller and faster software (yes it is, see benchmark).
benchmark: http://www.stefankrause.net/wp/?p=283
Edit: Added some reference benchmarks.