Loads slowly, lags a lot, crashes frequently

This app has become increasingly slow. I am using a brand new iPhone 7. There is no reason for this. Every time you open the app it takes several minutes to load, especially when youre on cellular. Things fail to load or lock up completely all the time, especially at inopportune times.
Lots of work and very little reward.

Too much drain on battery, and ruins your life.

Kinglereduary about Pokémon GO, v1.39.0