After Oreo December patch update Ram usage goes to 2.8

[xznewbie]

Hello guys. 

When I updated to the recent Oreo December patch.. The RAM usage was just 2.0GB but after days use I noticed the RAM shoot up to 2.8 GB that. I am sending screen shots as references. after the December patch

Now.

 I have not installed any new apps, the usage remain the same, but the battery use did not improve if compared to Nougat 7.1.1.Overall, the performance is laggy. Does anybody have these experience and how did you resolve it. Is their a way to the Nougat version 7.1.1as that's the Stable version. 

[xznewbie]

Changes in RAM usage display which is deceptive.. 

 Meanwhile this XZ tends to overheat, that the apps are difficult to run. The Camera fails to open. The screen becomes dark. This XZ is not really suitable for Oreo upgrade. It should have stayed with  Nougat as it's the most stable version for this unit. If anybody have any Idea how to reinstall  the Nougat 7.1.1 and wipe out OREO please let me know.. 

[xznewbie]

Some from Xperia asked if I had found a solution to OREO high RAM usage as well as low battery life. Well the only solution for this is to return to Nougat 7.1.1 but that is not possible unless you root this XZ which I am reluctant to do. So this issue remains UNSOLVED.. 

[NORCHAN]

IT TURNS OUT AFTER I PLAYED MOBILE LEGEND IN HIGHEST SETTING