Massive Random Framerate Drops Makes it Unplayable

From day one I have had random massive framerate drops to the point the game runs in slow motion and is unplayable. I thought it was just during combat, but it happens whenever: exploring, cutscenes, etc. No matter what settings it's on, low to ultra, it happens. I've gone through every solution I've come across on forums to no avail. 

I've resorted to playing on Steamdeck, instead of my higher end PC and TV, which is extremely disappointing.