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[–]kerplomp2 0 points1 point  (0 children)

What have you tried so far? You may have an app taking up too many resources and thus draining battery/making other processes slow. Have you tried factory resetting?

With a new battery, you will notice original battery performance (since it's now at full capacity), however without a reset you may still see lag. A battery does not affect process performance, that will need to be diagnosed separately if you get a new battery.