FPS drop under various condition

[FatFluffyBunny]

System Specs: i7 6700 @ 3.4GHz, Asus GTX 980 ti, 16gb ram, Windows 10

 

Hi guys, I would like to know if there's any possible fix for my problem. Before i go into details of my prob, I would like to say that I have tried many many different fixes but none of it helps (except shadow boost). I have already disable V-sync.

So generally I have fps dip in the usual city areas, down to about 20 fps when flying. Standing at the same place, my fps can drop from 60 to 30 just by looking at different areas. Also, my fps used to be high at about 60+ at Sanctuary Hills but now it's around 40+. I'm guessing the problem is with shadows but I've already tuned it down to the lowest. My other settings are at 1440p Ultra, even for god rays because i used a mod called Ultra Quality God Rays Performance Fix (No noticeable fps drops between high and ultra after using this mod). Strangely, average fps at 1080p is exactly the same as at 1440p. I'm also using many other mods that enhances textures.

The most annoying part is that when the fps is low, the cpu usage is only about 60%. My gpu usage is around 50%, max is 60% (@ 1080p).

I hope someone can provide some suggestions. Thanks.

 

Edit 1: After monitoring my cpu and gpu usage, i found something intriguing. When the game is running at 60fps, the cpu usage is almost 70%. However, when the fps drops to about 40, the cpu usage is around 50% or less. In both cases, gpu usage is around 50%. It makes me think that the cpu just give up, thus the low fps. I appreciate any form suggestions, who knows I might find a solution.

 

Edit 2: Edit 1 issue happens sometime. Usually, the cpu usage is 30% when fps is 60.

Edited June 30, 2016 by FatFluffyBunny