Is OBS slowing down my computer or am i just doing this wrong.

[MH2O_FTW]

For some reason, when i have OBS downloaded my computer gets slower even if i have the app closed. On fortnite, i usually get 170 fps but whenever i have OBS downloaded, i get 100 fps. i use an HP Omen 15, ryzen 7 4000 series, nividia geforce gtx 1660 ti. The 2020 version of the Omen 15.

 

[MH2O_FTW]

Update, now its at 70 fps instead of 100
Im just going to delete obs.