The performer should leave enough room to notice whether the audience is following.

Anyone holding a room can get carried by their own momentum, and momentum feels a lot like going well. The trouble is that a person who is racing has no spare attention left for the faces in front of them. Rooms rarely interrupt to say they are lost; they just go quiet in a way that is easy to mistake for concentration.

Build a pause into whatever you are presenting or explaining this week. Stop talking for a few seconds and actually look up. If the room has drifted, you would rather learn it in minute four than at the end.