Well, things went even weirder on 1.5, and imho not really great solution atm. Now vsync on is also forcing FrameRateLimit= current monitor max Hz on apply and game startup. So if you set it to a lower number to be inside VRR range, as 3fps bellow max Hz with vsync on, it'll be overwritten at game start back to = max Hz (p.e, back to auto =75 from manual =72 on a 75Hz VRR monitor). So, VRR users will still have to use an external limiter to kick at a lower frame rate while ingame vsync is enabled.
The current solution by automatically setting FrameRateLimit= at same Hz as vsync can reduce lag a little, but can cause some occasional stutter on non VRR monitors (because it'll limit vsync buffer, so a frame can end up repeated more often during frametime spikes), while it remains un-optimal for VRR. IMHO, it should be just left untouched (at 0 by default) by current menu options, for traditional vsync to work as expected, and to leave the user an option to use UE's frame limiter according to needs, even if not exposed in the UI.
Vsync on ingame is also forcefully disabling the separate menu 60fps limiter (if such option is enabled), so the menu fps limiting will be tied to max Hz instead (still bad on a very high refresh monitor). It only seems active (60fps cap enforced) under the condition that vsync is disabled ingame.
Thanks for your consideration
Unfortunately still an issue ;(
