Ashley no more performance issue after i restart ipad3, so its probably not a C2 problem, it was just weird...
with further testing, now i'm experiencing miss trigger sometimes, this does not happen everytime so i can't understand why its happening, its the first trigger of a 'on start of layout', calling a 'function' from another included event sheet.
testing on R167+fix, cocoonjs 1.4.7 launcher on ipad3 & iphone5, miss trigger only happen on slower ipad3, no problem on iphone5 so far.