I had the same issue with my old 6s but I recently changed the battery and it is shockingly fast now. The battery replacement only cost me $34 which is cheaper

I had the same issue with my old 6s but I recently changed the battery and it is shockingly fast now. The battery replacement only cost me $34 which is cheaper than buying a new phone. I have a SE 2 but since it doesn't have a headphone jack I will be sticking with 6s.