Use the charger that came with the phone, not a random one
A mismatched charger caps you well under the phone's real charging speed.
Why it works
Fast charging needs the phone and charger to negotiate a matching power profile. A charger rated for less wattage, or missing the right fast-charge protocol, forces the phone down to a slow fallback speed regardless of what the phone itself supports.
Did it work for you?
One tap, one report per person. Reports are how we find out which fixes don't hold up.
Related fixes
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Queue big downloads for wifi instead of letting them run on data
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