You can test some metrics in Lighthouse for "mobile" UI - it's a somewhat different set of considerations, which also focuses on some mobile-specific usability concerns. if you chive good results then your ReactNative-wrapped app would perform fairly well too.

There are other way to ship a mobile app, including developing a new UI using React/NextJS, Flutter, Ionic, etc.. and using UNA as a headless CMS providing API endpoints - in that case the performance will primarily depend on your frontend code. We do this for some clients and will be sharing more with community this year.