I hope it too , my mi6 have 2 years :'(I'm not sure if that is the case. The lag came back after a few hours and I am at 84% battery level and still have the problem.
I don't want to wipe dalvik constantly in order to not have lag. This is a very annoying bug and I hope it's solved on this week's release.
Enviado do meu MI 6 através do Tapatalk