Update performant-components.md

[nandorojo]

Small docs change.

[fortmarek]

Is there any reason for this change? 🤔

[nandorojo]

Yes. The current docs are incorrect. They use memo() inside of render code. As a result, it creates a brand new component instance on every render. This defeats the purpose.

I made a sandbox to show why the current docs break the React rules of memoization.

To test it, open the console in the bottom right, and then click the Rerender button. Notice that the component wrapped with memo still logs.

[fortmarek]

Thanks for the explanation!

We can merge this once you sign the CLA, let me know if you have any issues with that 🙂