An efficient morning can still lead to an overcrowded afternoon if nothing is left out.

A good morning can quietly overload the rest of the day. Getting through things fast frees up hours, and the freed hours fill immediately with everything postponed, so efficiency becomes a way of doing more rather than a way of having room. Nothing is ever removed, only rescheduled. Speed without subtraction just moves the crowding to the afternoon.

When a morning goes well, protect part of the gain instead of spending all of it. Take one thing off the day rather than adding two.