Maybe someone here can help me. My phone randomly runs like shit for reasons I can not figure out. Here is some examples of its fuckery, among lots of other similar stuff.
-Sometimes when I swipe to unlock the screen it's smooth as silk, and sometimes it runs choppy as hell.
-Sometimes when I browse reddit or rerolled it runs completely smooth, other times it will take 15-20 seconds to begin scrolling and scrolls at the equivalent of 5 fps.
-Sometimes if I turn the phone to sleep while watching youtube and turn it back on, it will run insanely bad, and when I make it sleep again it will take over a minute before it stops playing sound (that is how long it takes to respond to the button press). Other times it is completely fine.
It is an old Samsung galaxy s2 HD LTE(SGH-1757m, which is essentially a skyrocket) running Android 4.1.2. The phone always ran a little slow when it was switched from Jellybean to ICS ~two years ago, but I just chalked it up to it being unoptimized for the phone and it was always consistent with the little lag in the interface. However, recently I factory reset it to see if it would smooth this problem out. After the factory reset is when it started being completely random in its performance. I have tried factory resetting it again, investigating individual apps, and there is absolutely no connection between anything I have tried and when it decides to run like shit.
I am out of ideas :\