I downloaded your testmap and I can confirm that I do not get any stuttering. I even unlocked your FPS cap to get 200 fps and everything seemed fine. If you have a friend’s PC to test on I recommend you do that so you can see it for yourself. I have an i7 4790k, FuryX, and a 2560x1440 144hertz freesync display. (Thanks for automatically setting the resolution for me:) Best wishes for your project.
As for what might be causing your issue on your end I’m really not sure but I can see what’s happening in the video and that’s definitely not happening on my end at all.