FPS drop when I target/Inspect/loot/combat.

Hey guys, read here all the time, never really post, but this is one on behalf of a friend of mine, he's been having problems recently so im posting this from the wow forums here to see if any one can figure out the problem since I could not. Ive removed the logs he posted but if any1 wants to read them they can be found in the original post here -

eu.battle.net/wow/en/forum/topic/6893429991#new-post

Regards - Bake.

Hello everyone, This is the last solution I have before giving up. I've been struggling with this issue for a month now. My FPS drop from 150 to 13. still happens with Vsync. This issue happens when I target/focus/loot/inspect or in combat sometimes but rarely while idle.
I also noticed that when the FPS drop causing stutter in sound and pause in game that the CPu hit 0%
What I have tried:
Delete all addons, Move cache/WTF file to desktop.
reinstalled.
Formated the whole computer.
Updated everything including BIOS.
Changed the graphic card.
Tried Directx 9 and 11.
Tried every option in game or in the AMD control center.
downloaded some programs like throttlestop or RADEONPRO which helped a little tbh.
Tried overclocking but but couldn't do it well.
Changed the internet because i read somewhere in the forums that it could be an internet issue.
note: in League of legends I'm totally fine i have no issues there at all, In PTR it happens but much less than in retail even after the 5.2 patch.
Please help me because I want to get high in arena next season and with this issue i will not get anywhere

Sorry for the bad english and for people who say time for a new pc it is only 1year old

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