Bug/Issue Game stuttering

My game is stuttering/lagging.

GTX 970 and Core i5 on Win10.

-Ensured it is using GPU.
-Set Process Affinity.
-Reinstalled from dotnet and xna folder in dist folder of the game directory.
-Updated graphics drivers.

I have tried everything but it is making the game unplayable.
I am running a 144hz monitor and am wondering if that is causing the issue.

Any suggestions or ideas are welcome. I really want to play.

Thanks in advance !

 

Are you using two monitors? Whenever I plug in my second monitor I get random stutters through out my time playing

 

I am using 2 monitors.

After a bit more investigation I noticed it is an FPS drop. (There is a post about this so I am following that)

I read that it may help to install the latest XNA resdist (4.0) and reboot. I plan to try this tonight.