Problems with Fortnite

[imjps]

Summary:
After a couple hours my Fortnite instantly feels choppy and not smooth at all in fullscreen, until I switch it to windowed fullscreen...WEIRD???

Details:
Ok so I've been having this problem since i built my pc a few months ago. When I first turn on my pc and load up fortnite it runs very smooth and as expected (fairly stable 144 FPS capped) for a couple of hours and then out of nowhere it just flips a switch and instantly becomes extremely choppy and unplayable imo. It still says the same FPS tho, so I know its not frame drops or anything like that. The only fixes I have is restarting my pc to start the process over, or, as weird as this may sound, switching it to windowed fullscreen mode. The instant I switch it to that the game feels so smooth again and not choppy whatsoever. But once I switch it back to fullscreen, its soo choppy and feels like 50 fps like before.

I have no idea what could be causing this. I've tried just about everything.. overclocking my cpu, ram, gpu, deleting and reinstalling, updating all drivers, etc. Nothing seems to help. Everything in my pc is new, aside from the GPU, which was tested before purchasing and like new. Here are my specs..CPU-Ryzen 3 2200g, GPU- MSI RX 570, 8GB ddr4 RAM, ASROCK AB350 pro4 MB, 600w power supply, 240gb ssd, 500gb hd....I was thinking it could be a temp issue, but that wouldn't make sense because it instantly feels better when switched to windowed fullscreen. ANY suggestions will help, i'm lost :/

 

[.Mint.]

Do you have multiple things running in the background? There's a setting (forgot where it is in your PC) that stops anything from running in the background of full screen applications. If that doesn't work, open task manager when the problem starts to see if anything is overloading your CPU. That could also be the problem.

 

[Asadumer]

have you check your background processes of your system?maybe your system is utilizing some heavy resources that's why after playing fortnite for couple of minutes your system get hanged and choppy, disable or uninstall unusual programs.