I have been using the Kotlin MUI/React wrappers and had a pretty positive experience. Performance has always seemed same for me as with normal React/MUI.
I have nothing against Kotlin-first frameworks: but sometimes being able to use the existing React Components is helpful (e.g. I was able to put in place wrappers to use existing React components like Rich text editors, drag/drop, etc). I have also used the TanStack infinite query functionality to manage paging / virtual windows (like LazyColumn)