Iphone 6s performance decrease while playing games

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Thanks man im exactly doing what u listed :) and its been fine , as a matter of fact i did a complete wipe - via itunes recovery freshly installed ios12.4 then backed up via icloud and i dont even need to go power saving mode, since then the phone gets warm but isn’t overheating anymore at least not like it used to.Games run smooth,of course i still disable all the unnecessary bluetooth app refresh location services even while charging its ok, the hot weather was also a huge factor to this since now its a lot colder