Last week I flashed my Nexus 5 from CM11 to the newest Cyanogenmod 12 Nightly. This was my first experience with Lollipop, I did a fresh install with a complete wipe. Right after setting up CM12 I installed my frequently used apps, including the Disguised and Flashable Version of Ceberus Antitheft Protection, which I became used to in the last few years

The next few days using CM12 have been an awful experience, the OS was just slow, sluggish, unusable. I thought that it was all my own fault by installing a CM Nightly version instead of waiting for the first stable release.

I also installed the same CM12 Nightly on my Nexus 7 tablet at the very same time, but this device did not have these kind of issues. I dug a little bit into this, and as it turns out, the whole problem is the Cerberus App. Once uninstalled, the Nexus 5 was performing on the same satisfying level as the Nexus 7.

To uninstall the disguised version, I removed the apk in TWRP Recovery. First I mounted /system using the GUI, and removed the File via Terminal:
rm /system/priv-app/Cerberus.apk

Booting back into Android, I used the Android Terminal Emulator to uninstall the package. The Package Manager throwed some errors at me, nevertheless it looks like the uninstall has been completed.
su
pm uninstall com.lsdroid.cerberus

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