I recently upgraded my Windows 10 Home 64-Bit to Windows 10 Enterprise 64-Bit. This was a clean install and it wasn't actually an "upgrade" i just changed OS's. After the new OS, I was playing my usual games that I was playing before (Call Of Duty: WWII, H1Z1, PLAYERUNKNOWN'S BATTLEGROUNDS, Counter Strike, Rocket League), and everything was fine for about the first week. Then I launched COD: WWII and I was having input lag with my mouse, So i checked to see if maybe I had turned V-SYNC on on accident, which i did not. V-SYNC was off but my FPS was all of the sudden capped at 60 and it felt like V-SYNC was on. I changed my game to Fullscreen mode (I was previously on Borderless Windowed) and everything was back to normal. Shortly after I played H1Z1, which was completely fine, I got off and a few hours i got back on my PC and played some more H1Z1, after I got into a game I noticed that my FPS (In my opinion) was HORRIBLE. A Solid 30fps. The game was very stuttrey, and horrible. I checked task manager, and my CPU was at about 45% usage, my GPU was at only about 20% usage. What the heck. I went into nVidia control panel and changed my global settings to optimize performance instead of power. This didn't change anything. After hours of trial and error, Defragging my HDD, Removing my overclock, Changing my drive off of Read Only, Reinstalling, Verifying Game Cache, Moving the game to another drive, I decided to change the game into Fullscreen mode instead of Borderless Windowed. At last my fps was a solid 250. This is a problem for me because I am constantly multitasking, changing songs, streaming, and my main problem is that I have a 1440p monitor, which is duplicated to my elgato to capture my gameplay. Since the elgato only does up to 1080p, when a game is in fullscreen mode, it chooses the highest resolution that the elgato can use, because the games in fullscreen dont know that the elgato can downscale. Due to using fullscreen, This has hendered my 1440p gaming and games are now also fullscreen which reduced productivity, but they are also 1080p. I am looking for some sort of answers, to prevent this in games or maybe even turn it back. I have Clean installed all my drivers i do not think it is that, and all my drivers are up to date so please don't give me the obvious stuff, because ive tried all of that stuff. Im wondering if maybe there is some hidden setting in my BIOS, or maybe in nVidia control panel or GeForce Experience I dont know about to fix this. I am truly lost, and any help would be greatly appreciated, I will be happy to answer any questions.