[Q] lg optimus 2x su660 lags a lot topic

hi frndss i just want to ask that i have recently updated my lg su660 to ics 4.0.4 korean rom itys works perfect for only first 3 days and then when i start to install apps like facebook ,ifunny etc its start to get lag so much it take 1 sec to get back at menu from gallery or anything games also starting lag i dont what the hel i do plz help?