A fairly annoying problem with FiveM is the increased ping from normal. I noticed that on the development server I have on my own computer I have 15 ping delays. Since I have a server set up on my own computer, I should have a maximum of 3/5 delay (ping). This problem can be felt on every FiveM server, you just have 15 pings more than you should be. Not only does the delay (ping) play a very important role in FiveM, but you also have to take into account the increased delay.
In the attached screenshot I am attaching what my delay looks like in the case of disabled v-sync. This is my real delay, which I get the same by typing ping 51.77.44.72 in the Windows console
depending on your GPU the temps would be pretty normal otherwise you can use something like MSI Afterburner and set a more aggressive fan curve or perhaps it just needs a good cleaning.
Otherwise things look pretty normal and having vsync on or off shouldnt effect latency like that… at least i have never seen it effect it.