Patience ... something I really do not have. Neither with myself not with other people; especially with other people.
When it is impatience with self, I have only to talk to myself and get myself to buck-up or persevere.
How should you handle is when it isn't within your control. When someone else's pace is slower, less precise, less than what you need ... JUST ... NOT GOOD ENOUGH!
What about Time waits for no man?