The player loop is the configurable set of operations that make up the Unity Frame Loop. The default Player Loop comes with a variety of different subsystems, but the documentation is extraordinarily lacking.

Run when Time.time is updated. ^{[research needed]}

See:

• https://issuetracker.unity3d.com/issues/playerupdatetime-playerloop-callback-no-longer-works-properly-after-time-dot-deltatime-fixes
• https://forum.unity.com/threads/time-deltatime-not-constant-vsync-camerafollow-and-jitter.430339/page-9#post-6402103