80-85% RAM used

Hello!

I have strange problem. After OTA update from 5.1 to 6 I can't work on my phone because I have a lot of freezes.

In "use memory" I have information "80% occupied" (without opening any applications and after restart a phone) - so I can use only 300MB. Most memory gets "operating system Android" ~ 500MB.
I have also snapchat and Messenger, but on 5.0 are not caused any problem.

Someone has a similar problem? How I can fix it?

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