# Vercel Authors - Performance – SWR (Highlights) ![rw-book-cover|256](https://readwise-assets.s3.amazonaws.com/static/images/article1.be68295a7e40.png) ## Highlights - SWR only updates the states that are used by the component, which is only data now. If you are not always using all these 3 states, you are already benefitting from this feature.