Mobile Vitals is a new addition to Sentry's Insights feature, which helps mobile developers identify and fix slow app starts, screen loads, and renders. It tracks cold starts, warm starts, TTID (Time to Initial Display), TTFD (Time to Full Display), slow frames, frozen frames, and frame delay to provide insights on app performance. Mobile Vitals is useful for objectively assessing the current state of a mobile app, deciding whether to improve it, and continuously evaluating vitals metrics to avoid shipping slowdowns. Most metrics are instrumented automatically, but TTFD requires manual API calls to track screen fully rendered. Mobile Vitals is available to all paying Sentry customers and can be turned on in the SDK for free trials or paid plans.