Iphone 6 is super slower even after ios 11.1.1

As i can see so many similar posts having the same issue. After Reading so may comments, i think i have two options :

1. Wait for another fix (Frankly speaking i am not sure about that)

2. Rollback to 10.3.3 (i don't know how to do that without affecting my current photos folder)

Please suggest me the solution with procedure

Thanks in advance