Dex2oat,android system,so android and media server drain battery.

I recently bought a new phone with android 6.0 on it. I saw that there was a software update and I updated it. After the update was done, I looked at what apps are draining my battery and then I saw dex2oat,android system,so android and media server drain the most out of my battery. They weren't there before the update and now they are draining my battery. What happend?

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Dex2oat,android system,so android and media server drain battery.