using msi afterburner you can conveniently monitor frametimes. Something a lot more useful than frame rates.
https://youtu.be/PJoxJ3iXi9Q
Please do these tests on your system and post here the result. You can do something like a screen shot of the data.
It would also be useful to know if you have things like vsync on, or framerate limiters or maximum prerendered frames on. Also post your cpu/gpu.
It is also interesting to see how these behave in online games and as you apply different ui lag fixing solutions.