Attention: Here be dragons (unstable version)
        This is the latest
        (unstable) version of this documentation, which may document features
        not available in or compatible with released stable versions of Redot.
      
Checking the stable version of the documentation...
Quick start guide
- Turn on physics interpolation: Project Settings > Physics > Common > Physics Interpolation 
- Make sure you move objects and run your game logic in - _physics_process()rather than- _process(). This includes moving objects directly and indirectly (by e.g. moving a parent, or using another mechanism to automatically move nodes).
- Be sure to call Node.reset_physics_interpolation on nodes after you first position or teleport them, to prevent "streaking". 
- Temporarily try setting Project Settings > Physics > Common > Physics Tick per Second to 10 to see the difference with and without interpolation.