Under Settings > Performance:
• Set governor to NOOP
• Enable kernel samepage merging and purging of assets
Through Android Tuner Free
Under CPU manager:
• Set CPU0 to 918 or 1026 MHz
• Set CPU1 to 1026 or 1188 MHz
Under System manager:
• Set OOM to Medium or Light
Through Greenify
Greenify these apps if present:
Facebook, Facebook Messenger, Viber, Android Tuner Free, Outlook.com, Viber, Maps, YouTube, Yahoo! Mail. You can greenify everything else except those dealing with alarms, calls, SMS if you don't use your phone much / you don't need notifications from other apps.
If you have the Xposed framework:
Enable the Greenify module, and enable the first four options under Greenify > Experimental features. If you have the Donation package, enable everything except the last one.
As a bonus, you can also download Clean Master, put the widget on your homescreen, and clean your RAM every now and then - provided you unchecked the apps you need from the RAM cleaning menu in the app.
You can monitor your power usage using a widget named "CurrentWidget - Battery Monitor", search for it in Play.
Hope this helps
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