Camera.main is inefficient in frequently called methods

This inspection will want if the Camera.main property is accessed in a frequently called method, such as Update, FixedUpdate or LateUpdate. The Camera.main property returns the first camera that is tagged with "MainCamera". Internally, it does this by calling FindGameObjectsWithTag, and doesn't cache the result, so accessing this property frequently will have an impact in performance. Consider caching the camera in a field, and setting value in Start or Awake.

See the documentation for Camera.main and also th support document "Camera.main is slow".

This inspection was first added in Rider/ReSharper 2018.2.