The In The Jam lessons require very high video files and fast computer processing to play the videos in sync and switch the camera angles.
By default, the In The Jam player starts in ECO MODE or Economy Mode which serves a lower resolution version of the video files. This is recommended for slower computers.
You can turn ECO MODE OFF and view the high resolution versions of the video files. If you start to experience buffering or if the video/audio is out of sync please turn ECO MODE back on.