Use a Portable Battery Pack
Most battery packs are designed to enable fast charging. If you have a newer battery pack, chances are good that you can charge your iPhone very quickly while using it. Of course, using a battery pack all the time isn’t feasible, but if you need a quick charge ASAP and you have a Quick Charge 3.0 compatible pack handy, you may want to try it out to see if it charges faster than your wall outlet.