[Q] grand lag urgent help..!!! topic

i had updated to the latest stock firmware with 97mb update that came from ota...it was too much laggy so i installed gennxt rom ..still it lags too much what to do please help tried custom kernal also...please suggest me some other rom which is stasble not the kitkat ones as they are not stable yet and dont have dual simm....please help urgent.......!!??:confused::(