S5 G900V is getting slower (Marshmallow 6.0.1)

Hi, I wanted to know what could be the reason for this to happen ? I only have Facebook, Messegener and Whatsapp running on the background... I'm currently using Nova Launcher Prime and I haven't rooted the phone. It lags a lot in google chrome, or when I slide the notification bar, while going to settings and more. Thanks in advance !

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