Hmm I remember someone telling me not to do any hard/soft reset when the phone just updated to a latest OS/OS patch because it might interfere with the background indexing of the data. Not sure if it's true or not.
Those were due to bloat ware. My Sony Xperia Z2 already butterly smooth when upgrade to Android 6.
Don't forget iPhone LTE speed is lower than most Android flagship using snapdragon.
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