Go onto any subreddit for these Chinese android phones and tbf even some of the budget Samsung phones all slow down when the new android os update happens. That's if they even get the update on time. Quality control with these android phones is shit, they all claim to have the best hardware for the best price but none of that matter if the software ain't optimised at all.if your cell phone slows dowm after a year or two you bought a crappy android.