1. Update your Windows 10 per
https://obsproject.com/blog/five-simple-tips-for-new-streamers
2. Update your OBS per
https://obsproject.com/blog/five-simple-tips-for-new-streamers
3. In Windows 10 versions 1809 and newer, we recommend that "Game Mode" be enabled for maximum gaming performance. Game Mode can be enabled via the Windows 10 "Settings" app, under Gaming > Game Mode
4. Run OBS as Admin
5. Your GPU is maxed out and OBS can't render scenes fast enough. Running a game without vertical sync or a frame rate limiter will frequently cause performance issues with OBS because your GPU will be maxed out. OBS requires a little GPU to render your scene.
Enable Vsync or set a reasonable frame rate limit that your GPU can handle without hitting 100% usage.
If that's not enough you may also need to turn down some of the video quality options in the game. If you are experiencing issues in general while using OBS, your GPU may be overloaded for the settings you are trying to use.
Please check our guide for ideas why this may be happening, and steps you can take to correct it:
GPU Overload Issues.
6. The encoder is skipping frames because of CPU overload. Read about
General Performance and Encoding Issues.
