[create-next-app] scores poorly with Lighthouse

[SharadKumar]

Feature request

Is your feature request related to a problem? Please describe.

Lighthouse score for CNA is quite low. It would be good to set a good benchmark, to demonstrate.

Describe the solution you'd like

Achieve highest possible score, as a starting point for users of create-next-app.

Additional context

[timneutkens]

You're testing against the development build, not production. run npm run build and then npm run start to run a correct test.