Battery saving from chuwi hi9 pro

Why is my hi9 pro very fast when i use battery saving?

Most likely, you have lots of app running in the background, battery savers close them. Therefore it work lighter and faster ?

Thnx for replay but i don’t have a lot of apps and shut off them all. On battery saving mode works all perfect but only disgusting red banner🤔

If i am not mistaking, it’s a Android 8, oreo. Have you tried to check there if this problem is known ? I really think you might have a software issue, ‘‘i would back up data and reset it to factory default’’ and reinstall it afresh as a first step. !