I have Nokia 7.2 which is running Android One version 9. Since 2-3 weeks there I have observed a visible sluggishness in my phone. For e.g. it takes 1-2 seconds when I turn on/off WiFi or mobile data. Below are some of the steps I have taken to resolve this but none have succeeded so far.
- Deleted all the unused few apps
- Reduced animation to 0.5x from Developer Options
- Periodically verified
Settings > Batteryto check any misbehaving app. But it always shows 'Phone has typical background battery usage' - Made sure all the apps and Android is updated as and when an update is received. The current security patch is for 5 Dec 2019.
The sluggishness seems to restricted to the Android functionality itself like unlocking the phone, turning on the camera. The apps themselves run fine once they are opened.