Help with OBS

Jun 21, 2018
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I have a i7 8700, 16gb ram, and GTX 1070ti I cap fortnite at 120 fps and it runs perfectly fine, and then when I open obs, its still 120fps but its laggy and makes it kinda look like its dropping frames but its staying at 120fps and then as soon as I close it its back to being super slow, ive messed with nearly every setting on obs multiple times, can someone please help me
 
This is the guide I followed. It's one of the few out there that covers everything about capture without going into streaming, which I was not interested in. Take a look and see if any of the settings are different from what you're using.

[video="https://www.youtube.com/watch?v=dpgRWhFaoys"][/video]