A weird performance of Android 11 when AIMP is running and when it isn't

[rado84]

As I just said in my previous topic, I'm already with Android 12 but I thought I should post this report here for Artem to fix, if he can, and also for those who are still with Android 11 and are probably experiencing systemwide lag. To better explain that lag imagine running GTA 5 on a single core Pentium 4 computer and you'll get the picture. That lag out of nowhere was happening in random intervals for the past 6 months (Nokia G21).
In the past month, before A12 arrived, I discovered something weird - for as long as AIMP was running in the background (regardless of whether it's playing music or not) A11 didn't lag at all and was running very smoothly, even smoother than the Android of my old phone Redmi 9. But the moment I decided to close AIMP (I've set the phone to actually close processes of programs I've slided up to close) that lag returned and nothing could stop it - not a phone reboot, not killing other processes. The only two things that could stop the lag were to wait it out to stop on its own OR to open AIMP again. So in the past month I've been walking around with constantly running AIMP in order to keep Android 11 from lagging. Not that it's a bad thing, but it definitely looks weird and I figured I should mention that here, if anyone else is experiencing the same problem.
In addition to keep AIMP running, I also discovered that the more apps are open and running, the longer the battery lived. With these apps constantly running in the background (AIMP, Opera browser (not the Mini edition, the regular one with the red O-icon), Telegram, Twitter and Viber) the lag was MIA (missing in action) and the battery lasted 12 days with a single charge (the battery saver was ON and so was battery optimization for all installed apps).
So, if you're experiencing the same lagging problems with Android 11, my advice to you is: install nova launcher, enable battery saver and data saver, set all apps to have battery optimization and then open all of the installed apps you have and keep them running. I know it sounds weird but that's just the way it is. Android 11 is not from this planet, so naturally it behaves the same way. LOL