0. OBS is running on an Intel iGPU that is below minimum specs for OBS and is from 2013. This hardware is generally not powerful enough to be used for both gaming and running OBS. Situations where only sources from e.g. cameras and capture cards are used might work. Unless you need to record Windows stuff such as desktop and start menu, remove Display Capture from your scene and use Game OR Window capture for your scene.
1. Your GPU is maxed out and OBS can't render scenes (10%) and encode frames (95%) 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 V-sync or set a reasonable frame rate limit (60, 30) 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 want to use 900p, set the graphic settings in your game to minimum. 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.
Those are just the specs of the current computer I use for streaming/recording; that's my
signature.