[Xperia Z Q&A, Help & Troubleshooting] tOrNadO™:
Let me tel u the process.. U can try it on your own too..

1. Clean install a ROM and personalize everything and don't install Greenify.

2. Use it normally how u do as always and keep an eye out for your free RAM and battery backup.

3. Once after a couple of days of usage, Install Greenify.

4. Hibernate all your RAM eating apps such as fb, Whatsapp, etc.

5. Do use normally again as u always do and check the free RAM after a couple of days.

6. Compare the free RAM and battery backup. And most importantly the stability of your phone, i.e If your phone has gotten slow and laggy or Is it same as before installing Greenify.

7. If u don't feel good after installing Greenify, just uninstalling it and rebooting it won't really help u.. U have to flash back the ROM with/without data wipe and reconfigure all your settings.

Let me give u my feedback on this procedure.

At first, Stock was good. I used to lose like 1-3% on my XS which is normal in that device. My free RAM on it used to be like 200-250MB. Fellow xda'ians had posted that Greenify is helping them to get better battery backup. Hence i tried it. At first 2 days, it all felt good. I used to have same amount of RAM and battery backup was the same. After 2-3 days, my fw became unstable(Note that i had not made any changes to system nor any settings). Used my greenified apps casually as always). All apps started to lag. They made my phone hellishly slow. And then i thought since it hibernated my apps, it might take a few more secs to load the app from hibernation. But it wasn't just the loading time. My battery backup worsened. After Standby time, i lost like 15% to the max.. Then i checked my free RAM.. It was less than 100MB.. Do note that from 200-250 to 70-100.. U can see the difference.. I checked wakelocks in Better Battery Stats and there was Greenify at the top. No other wakelocks had much effect on my battery. Then i uninstalled Greenify and rebooted and also loaded all those apps again which were greenified. They started to work without much lag, but still not as fast as before. I noticed same battery backup when Greenify was installed. So i flashed back my ROM(Clean install) and restored my backup of apk's(Only apk, not data). And there u go, my phone performed to its peak and everything was back to normal as it was before.

Suggestions to obtain battery backup:

1. Turn off your phone and let it charge for 100%.

2. Let the phone settle after charging(Like 5-10 mins). If u start to use as soon as its reached 100%, it starts to drain faster.

3. Debloat your fw.(Most important thing). Also whenever u r switching b/w ur ROMs, do make a clean install.

4. Don't use any battery caliberating or battery saving app or Greenify(Just my opinion, u r free to choose).

5. Use your phone until battery reaches from 100% to atleast 7-8%. Do this cycle for atleast 2-3 times, that way your battery gets automatically caliberated to your usage and kernel too optimizes to ur usage.

6. Reboot your phone once in 3-4 days, that way some unused process will be closed automatically and safely.

7. Perform Cache and dalvik cache wipe if you are noticing any particular app is draining your battery, Ex: Google Services, Android OS, etc.

8. Turn off Auto Sync and sync manually whenever u need.

After following these steps, see the difference and let me know your feedback.. ;) Hope this helps a few newbies..

---------- Post added at 09:39 PM ---------- Previous post was at 09:37 PM ----------

Never undervolt unless u are certain u know what u r doin although even as a pro, few devs suggested me not to play or mess with it.. ;) Also u can stick to default governor/scheduler which is (interactive/cfq) i think. Keep it simple, don't mess with your kernel too much.. Have fun.. :silly: