Android 4 slows down over year without reason

Question

I have LG-P760 with Android 4.0.4, not rooted.



I have about 500MB free space on phone and for last year I haven't really install much apps and so on. Despite that, my Android started to work slower, than slower and now it's ultra-slow.



I don't recall installing anything, using it extensively, mess with rooting or anything like that.



But even simple loading web browser or backing too home screen to see the pinned applications takes enormous amount of time now.



I've already tried clearing cache of applications and restarting phone several times during last month.



What may cause such behavior and how to get back to normal?
I know one year ago this phone with virtually the same set of applications and amount of stored pictures/music/etc. was capable of running very smoothly.
It looks almost as it was programmed to get slow after year ;)


— PolGraphic | Sources

Answer

Try a factory reset. After a while, things get gunked up with tons of unnecessary files that aren't always deleted and a lot of other stuff.



However, your phone will always slow down over time because apps become more demanding as technology progresses. There isn't much that can be done about this.


— Ethan Z | Sources

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