full screen optimization windows 10 - can add input lag or affect mouse behavior?

[ASPIIDD]

Recently, YouTube began to give me videos where it says that "full screen optimization windows 10" supposedly adds input lag for the mouse and this function must be deliberately disabled in the exe file of a particular game, so that this win 10 function does not affect your aim. To my surprise, half after I began to read the comments and various queries in Google, I saw that people's opinions are divided somewhere 50 to 50.Those who say that the function needs to be turned off, motivate their opinion by the fact that on win10, because of this mode, the game does not start in "full screen" mode, but in some kind of "hybrid" which is similar to launching the game in "borderless window mode". Therefore, I want to ask knowledgeable people your opinion on this issue.

 

[TheNoobPolice]

You can see the reasoning for this straight from the horses mouth

https://devblogs.microsoft.com/directx/demystifying-full-screen-optimizations/

That post was a while ago and the system has become more and more integrated into windows now, and is also the only way Directx 12 functions at all (there is no such thing as "true exclusive fullscreen" in DX12.)

This is probably for the best, as exclusive full screen is hardly a smooth operating system experience, and a system that allows the benefits of both legacy systems of FSE and Windowed will ultimately be the only system that makes any sense moving forward.

And to answer your question, if a particular game was made before the feature existed and not designed with it in mind, there is a possibility it may well run at frame rates similar to windowed mode. Since frame rate is the largest factor affecting input latency itself,  then that would be the only interaction of the two components. There is no way in itself for the window method to affect the (x,y) packets that come from the mouse at driver level under the OS proper, and if any game processes mouse input relative to window functionally, it's a very badly designed game (as well as this being unheard of in any case, afaik).

Edited September 5, 2021 by TheNoobPolice