When you compile JSX to JavaScript, it produces a series of function calls representing the structure of the JSX. In a recent major version, React added a new set of functions which are more efficient at both runtime and during transport, and don't require an explicit import (which helps cut down on unnecessary dependencies).

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silverwind 3 days ago | parent [-]

You mean the automatic runtime introduced in 2020. It does not have any impact on the performance, it's just a pure developer UX improvement.

	▲	bastawhiz 3 days ago \| parent [-]
		It improves the bundle size for most apps because the imported functions can be minified better. Depending on your bundler, it can avoid function calls at runtime.