Finally, I was able to identify the cause of lags. As mentioned above, the swap partition is filled and not released, which causes the filling of RAM and lags.
If you close all applications, RAM and swap are r...
I see a graphical bug. It will be fixed?
montamer this is because the applications (Google, Google Launcher (?), Google TTS and many others) is not installed as a system app (/system/app/ & /system/priv-app/). One time I tried to do it, but unfortunately I did not succeed (maybe I did no...
Unfortunately UA is too unstable for daily use because of the new linux kernel.
For daily use I recommended https://forum.xda-developers.com/nexus-7/development/rom-android-7-aosp-grouper-t3467514/
Try google "nvflash" for Nexus 7. Attention! This is a low-level utility, if used improperly and there are no backups, RESTORE THE DEVICE WILL BE IMPOSSIBLE!!!
I strongly do not recommend this, the risk of turning the tablet into a brick is very ...