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Re:If your iPhone is slow, try replacing the battery by andruby on Sunday December 10, 2017 @01:21PM (#15892666)
I had a similar problem with my iPhone 6. Doing a clean iOS reinstall and backup restore made everything much better. Apps open a lot faster.
Re:If your iPhone is slow, try replacing the battery by gluestic on Sunday December 10, 2017 @02:49PM (#15893146)
Not for my phone it didn't. I noticed a marginal improvement at best and still nowhere near the performance iOS 10 had.

If you're on the fence on whether you should upgrade from an iPhone 6 or lower definitely stay away.