try these tips...
1)Settings-> Developer options and turn off -> "Windows animation scale", "Transition animation scale" and "Animator duration scale"
2)Turn OFF S pen (if you are not using that cr@p )
3) there are lots of bloatwares pre lded which one will rarely use, go to setting and DISABLE them.
4)Uncheck show notification in app which you dont want.
5)remove useless apps.
6)Turn OFF connectivity options(bluetooth, wifi, nfc s beam) when you are not using...
7)Uninstall ALL Task Killers and Battery savers....(also look for apps that stay in notification area)
and final one...
if you are using SD card below class 6 then move apps to SYSTEM STORAGE.
Slow SD can slow down your phone so if possible buy class6 sd or above.
If you have lots of apps moved to slow SD it will considerably increase boot time and lags...
hope I helped