1. The version of Windows you are running (1903, which will be supported by Microsoft until December 2020) has a limitation which causes performance issues in hardware accelerated applications (such as games and OBS) if multiple monitors with different refresh rates are present. Your system's monitors have 2 different refresh rates (144 and 240), so you are affected by this limitation.
To fix this issue, we recommend updating to at least the Windows 10 May 2020 Update. Follow these instructions if you're not sure how to update or set both monitors to same refresh rate or disconnect a monitor.
2. Change the refresh rate on your 144 Hz monitor to 120 Hz. The refresh rate should be an whole number multiple of the OBS common framerate.
3. At least one of your audio devices has a sample rate that doesn't match the rest. This can result in audio drift over time or sound distortion. Check your audio devices in Windows settings (both Playback and Recording) and ensure the Default Format (under Advanced) is consistent. 48000 Hz is recommended.
OBS Sample Rate: 48000 Hz
Headphones (3- Arctis 7 Game): 48000 Hz
Headset Microphone (3- Arctis 7 Chat): 44100 Hz
4. Run OBS as admin.
5. Having the YUV Color range set to "Full" will cause playback issues in certain browsers and on various video platforms. Shadows, highlights and color will look off. In OBS, go to "Settings -> Advanced" and set "YUV Color Range" back to "Partial".
6. Display Capture is the worst and should only be used as a last resort. Build your scene with Window/Game/Video Device Capture etc.