I think the Performance is the same like Android 11. The phone gets hot on Android 11 and also on CN Android 12. I Play pubg at 90fps. On global v 1.17 i get a light throttling After 60 minutes of Gaming . On CN V6.10 (Android 12) i had not played this Long time, beceause my Focus was at the touchscreen reaction. But i think the phone throttles also on CN Android 12, beceause the phone gets very hot during gaming and without a fan it will destroy itself. The Gaming Center looks a Little bit different, but i have not invested enough time. Sorry

At the moment i‘m back on global v1.17, beceause in my opinion the touchscreen works best on this version.
I use this phone also only for gaming, like a Gameboy. To make calls or write messages, i use a other phone. So I can nothing to tell about the battery life on CN Android 12.