I noticed that: 1. Android phones run a little bit faster after restoring to factory settings and """NOT""" installing apps updates and system updates. Of cours

I noticed that: 1. Android phones run a little bit faster after restoring to factory settings and """NOT""" installing apps updates and system updates. Of course they will be obsoleted, but the phone probably will run faster. Hypothesis: [Are apps and system updates too heavy for phones?] 2. Sometimes phones run faster after battery replacement. Hypothesis: [Are phones becoming slower because they do CPU underclocking/undervolting to work with degraded battery?]