disable apperance to increase performance

Hello!
Many time when i am using my phone i think of theming the UI and also the battery life of the android .
I install several apps like cleaners,modules,editors, to improve UI as well as battery life. But after many year i frustrated of getting the values balancing . If i increase the UI or some tweaks the battery will compromised and when the battery is tweaked the performance is compromised .
so i think of disabling the theming option . I have tried many things to disable the themes like disabling the animations and windows scale in developer options and tinting but didnt work

so please guys tell me any option to disable appearance . What ever option that is disable the theme please tell me . Even that it looks odd no problem. even it looks like old ui no prob.

"And please dont tell to degrade the os"

i am using android 5.1.1

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