How to solve Note 3 performance issue after upgrading to Lollipop?

A

AC Question

I have updated my version to Lollipop automatically. After that, I've got lots of issue happening and the most critical one is out of memory. System frequently comes up with out of memory. I have then uninstalled most apps but still the same. This causing me only can open 2 or if lucky 3 emails, then it said email service has stopped. Also slowing down the phone.
I have already performed factory reset but still ended up the same. Then I did hard-reset (pressing Home-Power and Volume Down button together, from safe mode). It improved a bit only (but probably this also due to uninstallation of facebook and some utilities). RAM is usually consumed up to 1 GB.
Is there any solution to this problem? Thank you.
 

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