I know this post is from march 2020, I know what this guy is feeling. I have been dealing with this issue since 2009, Is something weird
For example I've tried already monitoring with Msi afterburner using rivastatistic tuner, things like capping FPS, to have perfect frame-time, tried already vsync on/off (some games work better with vsync on) tried already blurbuster web page with a external phone camera to see if my monitor has skipping frames on 60-75 hz,as my monitor native resolution is 75 hz 1680x1050.
Temperatures are okay gpu is a EVGA GTX 1060 6gb, 40-50c with 0% fan so perfect
Cpu is ryzen 5 1600 first gen oc from 3.2 to 3.6 with same voltage, already benched this computer with (real benchmark) also used Userbenchmark to see if i had good result (and Indeed not bad results
Ram is 3200 patriot 2x4 (8 gb) more than enough for me in this windows 10 latest build 64 bit
But yeah I cannot enjoy games anymore is like my eyes get hurt/tired, like a desincronization while playing, my games looks like 20-30 fps, even if i set 75hz monitor and fps cap or vsync, is like even with vsync, 75 fps 75hz or 60 native 1680x1050 forced the vsync, the image in movement feels not crispy, feels like choppy, is like i cannot follow with my eyes my character at all, if i play games such Warcraft, Dota, Age of Empire, Torch Light, while there are much units on going, or only 4-5 monster spamming stuff, my eyes can easily lost my (hero target) my main character, is like i need to roll my eyes to try to focus is annoying..
Same with counter strike 1.6 i've played that 11hours in steam, I have since 2009 written in forums such steam/reddit/github/nvidia and so on.
Till the point some users were having the same symtomphs than me we came with a conclusion (it is the electricity) the dirty electricity (bad electricity hertz ) <-- not paired electricity too example
With a industrial power conditioner they came with a software that you can check the input voltage i.e 120/240 , and you can check the (output voltagE) <-- this feature output in electricity is insanely important
So some users noticed that their electricity input/output was something like
220 input, output 190! <-- they called the company and company was able to figure the cause and fixed it and voila 220/220 input/output (what happened) well guess what? smoothness back to their computers, tv, audio more crispy
And same with the electricity hertz <-- if you grab a UPS (double conversion) it will stabilize the hertz to match your America/Europe/Australia hertz, for america is 60, for Europe 50
So yeah some users in Europe were having a 43-44 hertz instead of 50, and for america same 54-55.
So overall it is important to pay attention to electricity company to the Dirty electricity, to check/measure the EMI (Electro Magnetic Interference ) buy a greenwave radio emi measure
Sadly here in Venezuela I have no choices, no money to invest, so yup till today im suffering my eyes hurt, so cannot enjoy games, at least those people fixed their problem.
If you think input lag is a problem, Visual lag is much worse
You can tweak windows latency properly optimize to reduce (excessive written to disk, reduce audio latency, improve keyboard input, mouse feeling/etc,etc )
But improving or reducing the visual lag wont happen until you invest money to fix that electricity/emi/rfi shit.
Cheers.