Why is the layest app on a24 one ui8 so slow and laggy any help? Ther were no updates to whether app sins one ui 8

When i first get my phone i select the biggest ram plus phone can have that whas 4gb. So after long run my phone will shutter games will shutter. And was just slow. After 1 and half years i decided to disable ram plus. Wow phone was top notch speedy ...

I tried everthing its just stop vibration..All my settings is correct.