[Q] LG G3 (d855), downgrade from 5.0 and/or root?! HELP! topic

Hey!
Going to make this as short and simple as possible.

So I was runinng stock LG G3 4.4.2, but about 1 week ago I recieved the 5.0 update to my phone. I was all glad and dandy until I got sick to my stomach with McAfee (unfreeze-able and non-removable) and games starting to lagg without device even getting hot...
So I decided to Root and run CM or some other more lightweight ROM, but to my greatest fear, 5.0 seems unrootable atm!? I am at a loss here.. I am in no way happy with the Lollipop update, I can't even see if my device is running ART or not, and the overall experience feels even more sluggish than before - Need a 'get out of jail' card over here ~

Sidenote; I've only ever owned Samsung Devices (S2 and S4) as main phones, so I feel a bit lost when it comes to how LG run things (no Odin is my primary issue, as well as limited support since the device is not all that popular).

TL;DR:
1. Is there a working Root for LG G3 International d855 (32gb, 3gb RAM)devices running stock 5.0?
2. If not 1: Is there a way to downgrade from 5.0 to KitKat again?
3. If 2: What's the best way to Root the device with, and what Kitkat version should I run?