xposed - Verified Boot

It strives to ensure all executed code comes from a trusted source (usually device OEMs), rather than from an attacker

If yes, any changes to the system partition will be detected and you’ll end up in a boot loop.

https://source.android.com/security/verifiedboot/

xposed - Optimize apps now

"Optimize apps now" menu item, will trigger cmd package bg-dexopt-job.

It 's available since Oreo and will start the job that usually runs once per night if the device is charging.

If you feel degraded performance after installing Xposed, it might be because all apps are running purely on JIT and interpreter.

That 's because Xposed needs additional information to identify methods it has to invalidate,

and that information will be determined during the next compilation.

If you want that to happen now, use this new feature. It took about 20 minutes on my Pixel.