FPS drops ONLY in 1920x1080p Regardless of other graphic settings.

[Exentenzed]

So this issue has persisted since the patch that upgraded KSP to unity 5. The only time i ever got FPS drops before that where whenever i made ridiculously large crafts or had big bases /w multiple crafts within rendering distance, but that was to be expected.

Since that patch however, i got 40-55 fps in the main menu and in-game, didn't think too much about it at the time because i was burned out on KSP at the time anyway.

But today, with the 1.2 on the horizon, I've been trying to figure out where the problem lies. so i tried out a few things. 

My issue is as follows:

I can run KSP in ANY resolution, either fullscreen, windowed, or borderless windowed (-popupwindow) and get 60 fps. That is until i try 1920x1080p, i can run it with a stable 60 fps at 1768x992 with all the graphics settings set to maximum. But it will go straight back to the 40-55fps area if i run it at 1920x1080p with all the other graphics options set to minimum, right after activating it it will drop down to between 40-55 fps and go back and forth between that, never settling down.

EDIT: apparently i did not check resolutions below 1920x1080p in fullscreen, it is in-fact fullscreen that creates the issue.

This problem persists both on 32 and 64-bit versions.

Currently running with:

Sabertooth 990FX

AMD FX-8350 8 core at 4GHz

Nvidia Geforce 970

8GB Ram

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Graphics drivers where updated at the release of the Battlefield 1 beta.

I have deleted and reinstalled KSP twice, removing any and all files from steamapps/common

and confirmed integrity of cache via steam.

I've tried the pre-release of 1.2, same issue.

Any help would be very appreciated.

 

Edited September 25, 2016 by Exentenzed