This is often caused by high resolution settings on a slow USB bus. Go to Options > Video Capture Pin and lower the resolution to 640x480 to see if the frame rate improves.
The SmartCamera Link software is designed to be lightweight, but it does have specific requirements: wwwjendoscopecnendownload smartcamera link
Ensure your Windows Privacy Settings allow apps to access your "Camera." Why Use Official Jendoscope Software? This is often caused by high resolution settings
Search for "SmartCamera" or "ViewPlayCap," as these are the most common software packages used for their USB and Wi-Fi camera modules. wwwjendoscopecnendownload smartcamera link