I would venture to say that your next floor position will be a piece of cake after enduring that level of hell!
Keep charting brief & on the essentials only : head-toe assessment, dressings, IV, drains. Do it immediately at the bedside; it takes like 2 minutes (unless you're charting narratives; in which case STOP it, except if there is an unusual occurrence that needs detailed info). My facility has oodles & gobs of education interventions & miscellaneous BS to chart each shift. Leave that kind of stuff for last when you have a moment to breathe; personally I would just let it go if it was a crap shift.
With that many pts, everything would revolve around giving the meds. Bundle as much care as feasible into that one med pass so you don't have to go back to the pt's room again right away.
How anal is your facility about meds being passed early/late? Mine isn't at all, so I always start passing meds right away when I see that it will be a crazy busy shift (1st pt's 0900 meds will be given about 0745 or so); this is for daily type meds, nothing time sensitive.
Believe it or not, you will get faster over time, but you will burn out quickly if you stay there. Good luck.