I am working on migrating one of my teams nextjs project from next 12 to next 13. We are using react 18 in our next 12 project. The only changes made were the node_module updates that were outlined in the upgrade document (https://nextjs.org/docs/pages/building-your-application/upgrading/version-13)

We use newrelic segments to track performance across different parts of application. One of the segment we track is the _document.getInitialProps function that we use. With no code changes besides updating to our next dependencies we saw around 200ms degradation in _document.getInitialProps.

Saw the same issue with next14, but that required some amount of code changes on our application