I think most Android phones starts to lag over time because people just keep downloading more and more stuff and never make an attempt to update sync settings or manage the stuff they download. I look at people's Android phones sometimes and they have 20 notifications at the same time. Like they'll have 2 different email apps syncing, location on, Bluetooth on, and every other app you can think of syncing every 10 minutes but will be shocked that their phone is slow
strong this. my boy is exactly like this with his note 3. got wild apps running, icons all along the top status bar on his phone.
my gf is tab hoarder...open tabs for days. phone and macbook lol