First of all Free up some ram :-
1.use custom kernels
2.use Disable service app from googleplay to disables all the unwanted programs
3.use system app remover download it from googleplay too to uninstall all the unwanted apps which r running at the backgroung and consumes lot of rams
4. Disable or Uninstall Unused Apps
6.Limit or Disable Background Data
7.Toggle Autosync data to off and tap Ok on the warning that comes up
Toggle all types of data syncing to off, including email, contacts and calenda
8.use Xbooster download frm googleplay to free up some ram
9.Check the internal memory space. A low internal memory might be the reason behind any severe lag that your phone is experiencing.
10.Restart the phone once in a day. This is a temporary option, but it works!
11.Overclocking your phone's processor. This will ultimately speed up your phone, but will eat up more battery juice than before.
Hit thnx if i helped you..