Posted this on official tech support forum as well, but figured it would be good to raise awareness here since so many are having fps issues.
Win 10, i7 4930k @ 4.2ghz, gtx 970, 16gb ram, 1080p @ 120hz
Using latest Nvidia drivers
Tested without any addons installed
Tested with deleting my entire WTF folder and starting fresh
Since the patch, triple buffering seems to be extremely buggy and not working correctly while in fullscreen mode. Normally when running with triple buffering and vsync enabled, it is supposed to give you your full range of fps up to your monitor's refresh rate. In my case that is 120 since I have a 120hz monitor. Normally when vsync is enabled, but triple buffering is disabled, your fps will be capped in steps of something like 30/60/120 - so if you're viewing a scene and you're only able to get 45 fps, you would be capped at 30 until you are able to reach 60 fps again. This can cause HUGE stuttering depending on what you're viewing as you could be jumping from 30 to 60 fps constantly (in my case it's usually 60 and 120) which is why triple buffering is recommended when using vsync.
Before the patch, triple buffering worked perfectly and there were no issues - I got my full range of 1-120 fps, but now my fps will constantly snap to EXACTLY 60 fps when I'm actually getting something around 80-100 (checked by turning vsync/triple buffering off) as if I have triple buffering turned off. It'll be working fine one second and my fps will be fluctuating normally around 80-120 fps and then all of a sudden it will snap all the way down to exactly 60 and stay there as if it was being capped by triple buffering. It is extremely weird - as if triple buffering is randomly turning on and off.
This only happens in fullscreen mode. Windowed fullscreen seems fine, but I'd really prefer to play in fullscreen mode like I was doing and still do with all my other games (due to unrelated stuff with my setup).
I tested all the different graphic options - disabling each on by one etc, but could not find any link to this issue. I also tried forcing triple buffering on via Nvidia control panel just to ensure it was on, but that didn't do anything either - probably because it actually is enabled just fine ingame, just not working right since the patch.