If you don't know the internals of MIUI and what "MIUI optimization" affects, then keep it zipped.I'm also trying to disable it once and for all, and the reason is really simple.
MIUI optimization is bullshit, it's a matter of fact. Stop being fanboys.
What you "believe" makes no difference. If you don't see a "MIUI optimization" toggle in Developer options, it means that it's enabled (and hidden so that it won't be touched by users who have no clue what they are doing).I'm the opposite, I want to turn it ON. I'm using miui.eu 11.0.5 stable on my Redmi K20 Pro Premium Edition and I believe that MIUI optimization is turned OFF. The reason I think it's off is because the battery drain on MIUI.eu seems to be higher than the stock MIUI China and MIUI India roms. Both have decent battery life in comparison to MIUI.eu. Both have the option to toggle on/off MIUI optimization, whereas in MIUI.eu, this option is missing under Developer Settings.
Another reason why I believe MIUI optimization is OFF on MIUI.eu is due to how the apps are managed in the background. I've purposely set a few apps to not run in background, and yet they still run in background. I've set the battery restriction for the app to be restricted, as well as setting the MIUI App Battery Saver for the app to "Restrict background activity". Despite this, the apps still run in background and I still get notifications from them. This was never a problem in the stock MIUI roms. I'm using the same apps, nothing is changed. I believe when you turn off MIUI optimization, this changes the behavior of how the apps are managed in the background.
In the MIUI 11 Stable changelog made by xiaomi.eu, it says this "Optimized RAM consumption" and I'm not sure if that is related to the MIUI optimization changes.
I've also tried running adb shell and using "getprop persist.sys.miui_optimization" to query whether this setting has been toggled or not, but this doesn't return anything. If miui.eu is based on the China rom, then MIUI optimization SHOULD be under Developer Settings, but it's not. Where has it gone?