My girlfriend bought a Lenovo K6 with Android 6 a few months ago. After some time, I tried to use her phone and I notice that the touch responsiveness was very slow. I feel a delay in every touch (open app, keyboard, screen scroll, etc).
I tried to uninstall some apps and upgrade to Android 7 but nothing change. The curios thing is that the problem not happens in the screen where we need to put the password before load the Android (after a restart), so I think that is software a problem.
I'm almost doing a hard reset in her phone to see if the problem is resolved. Before I do that someone have any idea how resolve this problem?