The bleedin obvious here; PBP is a 750 mile event, run by the French in France for 3000+ participants, controls, particularly in the earlier part of the ride will be busy.
Even though controls now offer ‘resto rapide’ in addition to sit down ‘school dinner’ eating passing through controls quickly will be challenging, the process of parking your bike, finding the control, stamping your card takes time. The route showcases rural France (as LEL) there will be numerous spectators handing out coffee, cake and snacks, but surprisingly few cafes are open late. Few if any 24 hours petrol stations or open all hours convenience stores are available along the route.
For me tiredness is a major issue, one to accept and cope with, sleep as best as you can, where you can.
Basing your strategy on foraging en route during the day may save some time but I wouldn't rely totally on this.
Anyway, the controls are all part of the fun and a memorable experience.