I am a newbie. I make some considerations on the input lag of my favorite game.

[paXiomX]

Hi guys, I read you from the outside and you are a forum full of competent people.
I'm Luca, an Italian boy and I play mainly Fortnite in a semi-competitive way. I recently purchased a 144hz monitor, the AOC C24G1 (Freesync, but G-SYNC compatible).

For weeks I have been looking for the best configuration to have the least possible input lag and to be fast in movement.

I tried:
1) 160fps with G-SYNC active
2) 144fps with G-SYNC active
3) 141fps with G-SYNC G + V-SYNC ON in the Nvidia panel
4) 141fps with G-SYNC active + V-SYNC OFF in Nvidia panel
6) I disabled the freesync on the monitor, I cap the FPS to 160fps.

I must say that among all these tests, the last one seems to have given me the greatest results in terms of input lag, that is, I totally disabled the freesync and I set the fps to a slightly higher value of 144fps. I noticed that with the G-SYNC I was losing some "speed".

Do you think it's placebo effect? Or was it the best solution? In all cases, I always kept the ultra low latency mode in the Nvidia control panel!

[TTT]

Lowest possible is all syncs off.

VRR isn't laglass, its just much less than Vsync.

Also don't max your GPU, cap the FPS so your GPU isn't going over 90-95%.

Also don't use Ultra, leave it set to ON(1).

[paXiomX]

Why is it convenient to use it on ON and not on ULTRA?

[Chief Blur Buster]

Lag is not a single number --

I am not surprised that the last item VSYNC OFF (#6) performed faster.
This is because VSYNC OFF is the only way to bypass scanout latency.

Also, VRR capped lower than max-Hz, will usually not activate VSYNC OFF for most refresh cycles, even if you configure VRR+VSYNC OFF. The second sync setting (after VRR) is a fallback backup sync technology that only activates for specific frames with frametimes faster than max-Hz refreshtimes.

There's
-- Absolute latency (the average latency)
-- Latency volatility (how much latency varies from measurement to measurement)
-- Latency gradient (how much latency varies from top edge through the bottom edge of panel)

VRR is the world's lowest latency "Non-VSYNC-OFF" sync technology.
The only latency caused by VRR is scanout latency (the latency gradient).

You can reduce VRR scanout latency by using a higher refresh rate.

144fps G-SYNC at 360Hz = least lag
144fps G-SYNC at 240Hz = less lag
144fps G-SYNC at 144Hz = more lag

This is because of scanout latency, because any "Non-VSYNC-OFF" technology has a mandatory scanout latency.
360Hz = 1/360sec scanout.
240Hz = 1/240sec scanout.
144Hz = 1/144sec scanout.

TL;DR: It's very hard to beat VSYNC OFF for absolute lag. However, if you want to reduce VRR latency penalty, reduce scanout latency by getting highest-Hz you can afford

See the VRR scanout latency penalty practically disappear at higher Hz, here's 60Hz vs 240Hz VRR. The lag difference almost disappears!