Best settings for low input lag on a monitor?

MyHbblike123

I recently got the Acer KG241 144hz 1ms monitor, and started playing Fortnite immediately on my ps4, however, I noticed quite a bit of input lag, I’m wondering if that’s because of the v-sync in-game or my monitor. I thought that it’s probably the v-sync (no such option on the ps4), however, I still wanted my monitor working at its best, as I don’t like a lot of input lag/latency. So is there any specific settings in the monitor itself for me to tweak a little? I have 3 gamemodes, action, racing and sports. Please help!
One thing to add: I also use the monitor for my laptop, but I don't any input lag on that, which then made me sure, that it was the games fault.

Ebutton

Did anyone help you with this? I have a similar situation using my xbox to play at 120hz with the same monitor. I’ve tried tweaking a few settings and sometimes they seem to help a little bit but for the most part I haven’t found permanent fix.