Your patience with the slowest learner is being watched by everyone scared they’re next.

Nothing signals more clearly than the way the person struggling most gets treated, and the audience for it is everybody who privately suspects they are next. If learning slowly gets met with impatience, people hide what they do not understand, and then nobody learns anything where you can see. Your patience is a statement about what is safe here.

Pick whoever is having the hardest time and go slower with them than you want to, where others can see it. Do not sigh and do not rush them. The people you were not even talking to will take the lesson.