Worraps wrote: ↑27 Dec 2021, 13:33
I am using the native res on these scenarios.
To clarify, I wasn't suggesting non-native resolution was your issue. That was another user's issue on another G-SYNC Compatible model. I'm just saying there's precedence for monitor firmware causing alt+tab issues, but there can be different triggers.
Worraps wrote: ↑27 Dec 2021, 13:33
Gmes on native res, fullscreen/borderless (same outcome), with VRR enabled in the OSD, G-Sync Enabled Globally, but G-Sync Disabled on these games creates slow ALT-TAB.
If I disable VRR in the OSD, it will also disable it in the NVCP because the monitor doesn't get recognized as G-Sync Compatible. If I disable it in the NVCP, I will have to turn it on when playing a G-Sync game. I just wanted to turn it off for a few games without compromising my ALT-TAB experience, which imo doesn't make sense.
Okay, then I initially misread. You're saying you have the NVCP and monitor VRR options enabled globally, but your issue comes only when you selectively disable G-SYNC for certain games, at which point only those games alt+tab slowly unless you disable G-SYNC globally.
If that's the case, I'm surprised selectively disabling G-SYNC per-game
ever worked for you in this respect; it's never been reliable or glitch-free in my experience, even on native G-SYNC displays containing modules, a reason I personally just enable/disable it globally when needed.
What's likely happening in your scenario, is while G-SYNC is disabled in the game, when you alt+tab out of it to the desktop, the desktop itself switches back to G-SYNC mode (and visa-versa after alt+tabbing back into the game), which causes the black screen + delay. I.E. the same thing that happens whenever you toggle and apply G-SYNC globally in the NVCP.
I don't currently know of a workaround in that case, since I've never tried that hard to troubleshoot it as I typically use G-SYNC for everything myself. Could be monitor model-specific, could be driver-related, could be both, but in my experience across multiple G-SYNC-capable monitors (with and without modules), it's not unusual, as you're basically asking it to switch in and out of G-SYNC mode every alt+tab.
An alternative would be to keep it in G-SYNC mode for these games, but disable V-SYNC, which means so long as the framerate is above the refresh rate, G-SYNC won't engage, but then we get into the issue where you think there's more input lag with G-SYNC enabled even in that scenario (short answer is there's no technical reason there should be).