The `Interaction to Next Paint` (INP) metric measures how responsive a webpage is to user interactions, with lower values indicating better responsiveness. INP is an experimental metric that aims to replace First Input Delay (FID), and its stability has been announced, which may impact search rankings. React can improve INP by using techniques like selective hydration with Suspense, which enables non-blocking hydration and prioritizes interactive components, leading to faster page interactions and lower FID values. This approach also improves other metrics such as Total Blocking Time (TBT) and Time to Interactive (TTI), potentially enhancing Lighthouse scores. The use of INP has been demonstrated in a case study with Next.js, where the site's INP was reduced from 430ms to 80ms using selective hydration with Suspense, resulting in improved Vitals metrics.