https://bundlephobia.com/package/react-dom@18.3.1 130kb for react-dom 15-18 (would check more but site has rate limited me...)

So, while yes the very latest version of react is *finally* as slim as competitors like preact, don't act like all the legacy projects where a migration is off the table due to time or money just don't exist.

I just created a new vite react project. All it does is render:

function App() { return <div>Hello world</div> }

Publish it as if it would be deployed to prod. ~185kb