DraStic

It was working normally,but then it suddenly started lagging, could it be a low battery problem? I tried reinstalling,deleting all the backup data but it still lags a bit

Are you experiencing lag in-game or with the interface?

Some smartphones get slower if the battery is low, charge it to 100% and retry with no battery saving mode enabled.
Also check if the internal memory is full, some smartphones have performance problems when it is full

I think i discovered the problem,it seems to slow down whenever i use my ps4 controller, maybe it's bluetooth related?

When you are using a bluetooth device the processor needs to convert the data that he just got in a file or a command, if you have a weak device that is probably the problem

Makes sense,can you a recommend a good wired controller?