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"A better emulator"
That just isn't really the problem though, these same emulators were perfect before.
If you have them both, please try Castlevania Aria of Sorrow on GBA.emu
It's unplayable on 4.4, but perfect on later android versions, even with 0 frameskip and hq2x rendering. Now on the other hand, the My Boy! emulator seems to work nearly as well on both android versions and I played through Tomba with FPse partly with 4.3, and finishing it on 4.4, I noticed very little difference. So not all emulators have taken a hit, but it's there even in the system.. and don't get me started on battery life.
Basically I'm kinda agreeing with you. But, there is some issue either with Android 4.4, or whatever Nvidia did.
A little more on Topic. Ever since I disabled the notification from Google Services, and deleted the update from the cache partition, It hasn't downloaded again! It's been 2 days since I did that, and It's had plenty of times to download an OTA. (reboots, sleep with wifi on, etc.) It might download if you go to the update settings, so watch out.