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React's shouldComponentUpdate hook seems to be a bit of after thought and a bit of relatively complex over engineering.

A comparison of mithril can see that React is almost 2 times as slow.

https://mithril.js.org/framework-comparison.html

The only reason to use React for SPA is the job market, and that companies like the fact that is backed by Facebook.

React is far greater than 2x as slow on some metrics, like boot time, but the newer versions actually aren’t as bad as the pre-fiber versions that those benchmarks are based on for DOM updates. For boot up time React is still about 5x worse than Mithril, but on create & update benchmarks they’re now at least in the same ballpark.

https://krausest.github.io/js-framework-benchmark/current.ht...

Nit: shouldComponentUpdate is a lifecycle method, not a hook. The corresponding approach in React's new world is React.memo.

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