good news! ashley fixed 2 issue i mentioned earlier, no more turbo after re-enter game, and accelerometer is reversed to normal!
further testing and comparing the performance of ejecta and cjs, testing with a simple infinite game i'm about to release on iPhone5, here is the result from xcode debug monitor:
Loading the game at beginning(not counting the splash):
Ejecta is at least twice as fast to finish loading.
Title layout idle:
Ejecta use 30% CPU while Cjs use 70% CPU
Ejecta use 60~70% CPU while Cjs use 70%~100%
Ejecta use 125mb, Cjs use 160mb.