Android often shows clever transition effects when youâ€™re navigating around the phone, sort of redrawing the screen.
However, these effects can eat up phone resource too.
Disabling lock screen animation can also speed your phone up.
Itâ€™s very likely that your phone came with a load of preloaded apps that you never asked for and probably never use, typically known as bloatware.
If youâ€™re not using them why not disable them, after all they can run in the background, even if youâ€™ve never opened them, which of course means they are using up device resources.