Fps Drops once I open OBS

[lordooevo21]

PC Specs:
i5-8600k 3.6GHz
GTX 1080 G1 Gaming
16GB RAM
Monitor 1: 1080p 144Hz
Monitor 2: 1080p 60Hz

Problem: Once I start up my pc it works fine, my fps is between 150-200 but when I open OBS with not even start streaming and start a game like "League of Legends", it drops to 60fps. I have tried to uninstall and reinstall OBS many times, it doesn't work. I have also tried to reinstall Graphics Drivers and Monitor drivers but still the problem.
My problem started when I updated Windows Build 1803. I tried to go back to my previous version but the problem stilled there.

 

[aleantralt]

Note: 60FPS isn't really complainable (unless, when you start streaming, it drops to sub-30fps)

Your rig is supposed to handle LoL (and others) like a piece of cake.
OBS is known to be usage-happy, so it isn't your game settings.
Until you start streaming, disable the ''Display Capture'' in the middle. It will boost your FPS up until you start streaming.

 

[uppercut4u]

Make sure vsync is disabled in NV control panel

 

[WinxtinctonYT]

Had the exact same problem with my OBS and i have and i7 - 8700k 2060 rtx and 32 gigs of ram and nothing worked untill i removed all the sources and scenes from OBS and suddenly the game were running as they should. Do let me know if this works for you.