Aerofly's VSync doesn't work for me at all. I've recently posted on Steam about this. In order to keep things simple, here's my post:
Are you sure the VSync option is working correctly?
While all of my other games are correctly capped at 60 FPS (as my screen uses 60 Hz) when enabling the VSync option, Aerofly's values happily jump somewhere between 90 and 200 FPS.
The only difference between VSync disabled/enabled is a slightly lower FPS range when enabling it (at least that's what it looks like). Changing the VSync settings of the Radeon driver doesn't have any effect. I'm also still getting screen tearing while Aerofly's VSync option is enabled, which is the very thing VSync is designed to prevent. I would say VSync isn't active, although it says so.
Edit: Not to mention roughly 2000 FPS while displaying Aerofly's menus that make my graphic card's coils whine (seriously).
Here's a more detailed example:
Aerofly's main menu right after launching it: 3430 FPS with no framerate limitation, 2180 FPS with VSync activated.
I'm using a Radeon RX 580 with 8 GB, but I'm aware that most people here seem to use Nvidia GPUs. Are there any Radeon users here who have Aerofly's VSync option working as intended?
Edit: While enabling VSync in the app-specific settings of the Radeon software has no effect on Aerofly, I've just noticed that setting it to "Always On" (and Always On only - nothing else) in Radeon's global settings has. So that's the only way to make VSync work in Aerofly I've found so far. But this is sort of work-aroundish, as it affects not only Aerofly, and Aerofly's own VSync option still doesn't work on my system.