I've turned on "reduce motion" to prevent the phone from adjusting my wallpapers.
My friend did mention about the reduced charging speed of the phone, and it got better after turning off "Background App Refresh".
I left that on though since GPS locating services will not work if you turn that off and that your application falls into background mode.
I hope it helps a little?
I used to charge my phone once a day, but now I have to charge it at least twice a day.