I've tried many things so far to try and fix this issue, anytime OBS is open (both studio and classic) my FPS goes from 200+ to 20fps. Even if its not recording/streaming and preview is off. The only thing that I found fixed it for a short time was setting the encoder to Nvidia NVENC which no longer works.
PC Specs: GPU : Intel(R) HD Graphics 4600,NVIDIA GeForce GTX 1060 6gb CPU : Intel(R) Core(TM) i5-4690K CPU @ 3.50GHz Memory : 32.00 GB RAM (31.84 GB usable) Current resolution : 1920 × 1080, 144 Hz; 1920 × 1080, 60 Hz Operating system : Microsoft Windows 10 Home Internet speed: 100 up/down
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If its not recording/streaming and preview is off then it's impact should be close to zero. Open up task manager and check what is occupying your CPU time.