Starting with iOS 15, the system might pre-warm your app by creating the process before the user opens it. In such cases, we can't reliably measure the app start, so we drop it as of sentry-cocoa 7.18.0. We are working on a fix for this. Follow the GitHub issue for more details.
We recommend updating to at least 7.18.1, or else the SDK might report too high a percentage of slow frames.
We recommend updating to at least 7.11.0, because before this version the SDK might falsely report out-of-memory crashes when an app hangs, and the user kills it manually.