I turned ART on my Moto G, and now whenever I reboot the phone, it says 'Android Is Upgrading' is this just because ART is an experimental feature or is there something wrong with the phone? Thanks in advance
Welcome to Android Central! That shouldn't happen every time you reboot. When you switch from Dalvik to ART, you'll see the "Android is Optimizing Apps" message the first time you reboot, but afterwards, it shouldn't happen again.
Try booting into Recovery and wiping the cache partition.
Hey, Thanks for your detailed reply! Unfortunately clearing the cache didn't work, one other thing I should probably mention is that when I switch to ART the battery drops probably 1% every 30 seconds with the screen on.