lag on asphalt 8 on i phone 6 with ios 8.3

um using an i phone 6 64 gb with ios8.3 . um facing lag prob on asphalt 8 updated version. i dnt have too many apps or games in my phone..what is the solution..the lagg is very minor. but as i know i phone do not lag on games ...so its affecting my mind very badly...plz help ..😢