iPad mini 4 touch screen slow after update to iOS 13.6.1
I use iPad mini 4 with original iOS 10 for playing games and streaming videos.
Recently one of the game server stopped supporting my game score updating, and I have to update the game app (which needs iSO 11 or later) in order to keep the scores. I don't know how to slightly update to iOS 11 or 12. The only option from iTunes is to have iOS 13.6.1.
After I update my iPad mini 4, it seems that the screen sensitivity is much slower than normal. Not only in the fighter plane shooting game app, but also Clash Royale, other games, YouTube and normal Safari web scrolling, which require finger(s) to slide across the touch screen. Web page scrolling seems could not catch up to the speed of my finger tip. For gaming, feels like dragging a boat through mud water. YouTube video would be a bit disturbed about every 10 seconds.
My iPad have 4G of free space, I have deleted those unwanted apps from the iOS update, disabled all the Siri things, disabled all the background app refresh... but the problem still exists.
Is there any way to fix the issue?
iPad mini 4 Wi-Fi