Now I know something's wrong with the latest version of Windows 10 that make's reshade incompatible with Fullscreen optimizations disabled and you might wonder why do I want to even disable FS Optimization. Well the answer is Scanline Sync. This new syncing method allows users to get adaptive vsync experience without the input lag of adaptive vsync.

Unfortunately, if Fullscreen Optimization is enabled, then scanline Vsync doesn't work with downsampled resolutions. Infact, Vsync off doesn't work at all. Windows 10's DWM takes over and prevents screen tearing on games but unlike regular Vsync, windows 10's DWM works like Open Gl's Triple Buffer/ Nvidia's Fast sync but adds severe input lag [Which makes it worthless]. Also, since it doesn't work like regular Vsync, the frame times aren't synchronized and results in microstutters/ skipping and stutters just like Fast sync. It is possible to at least prevent the stutters by enabling Vsync and using FPS limiter to even out the frame times. But it defeats the purpose of scanline sync.


So far, the only way to use Scanline Vsync/ Adaptive Vsync on Fullscreen with downsampled resolutions is by disabling FS Optimization but that means Reshade can't be used. However, Nvidia DSR doesn't suffer from this issue. But downsampling using custom resolution is a lot better since the filtering method by DSR is garbage and only looks okay on 4x multiples of the native resolutions.

I don't know if it can be fixed, hopefully it won't be that hard. Then again, it's windows 10's and Nvidia's fault for not fixing their shit. I've already posted about these issues on Geforce forums but like always, Nvidia won't be bothered to fix anything. I will post more info if I figure out anything.

Reshade works with FSO disabled. All my games are FSO disabled -- have to, I use SLI

What makes you think it doesn't? What games are you having a problem with?

Edit: I'm on 1803 fwiw, and you say 'latest version of Windows 10' are you on 1809?

Martigen wrote:
What makes me think? You are saying that I just think it doesn't work without actually trying it?



Let me see what didn't run:

-House of Dead 3
-FiFA 10
-FiFA 09
-Sega Model 2 emulator
-kega Fusion
-FiFA 15


Basically anything I try. The games wont even start.

Dude... drop the snark. There's no need for that.

Logic should tell you the problem is on your end if you're BOTH on 1803 and you're having issues and he isn't.

TreyM wrote:
FS Optimization issue isn't only affecting me. I've seen it on other threads [Example: reshade.me/forum/troubleshooting/4574-cr...aunch-with-dx9-games]

Try build 1809. I think MS improved FSE in it. I no longer disable it and have no issues.

MonarchX wrote:
Unfortunately it still forces DWM Sync when using custom resolution to downsample.

Your best bet would be to ask about this on BlurBusters forums. They have Sync experts and they go deep into those discussions. If custom resolution is the only DWM-Sync-forcing scenario then it may be up to NVidia drivers to fix the problem, may not even be Windows-related. I also know that some Unity-engine-based games, like Pillars of Eternity, do not even support FSE and that disabling FSE in DirectX 9 games also disables G-Sync. FSE Optimization remains a mystery to many... It does something with mouse sensitivity and I can't even explain what it does... It's like it makes the mouse glide... differently. On BlurBusters I posted a link to some MS tutoring videos that go into detail about the new "flip" methods in DWM and FullScreen, etc., bla bla...

Luckily, there's always Windows 1607-14393 without FSE Optimization. I would also suggest to make a clean Windows 10 install with all Game-related crap removed and only NTLite (free version) can do it cleanly. Even Windows 10 1607-14393 had KnownGameList.bin file and game-related DLL files that would hook onto File Explorer, detect whichever games you're playing, and enforce some settings. In NTLite you need to have 2 main components removed before OS install - Game Explorer (from Media) and Xbox (System Apps).

MonarchX wrote:
I found something interesting. I realized why others are saying they aren't facing the same issue.

DWM sync on custom downsampled resolution is forced only with DirectX 9 and 8 dlls of reshade. Any game that uses dx11 works with with FSE disabled with custom downsampled resolutions.

Don't know why this happened but at least I finally got lead that might be useful.