Current The Spaghetti Detective plugin is sending 1 frame every 10 seconds when the printer is printing. The frame rate is even lower when the printer is idle.
This frame rate is good enough for automated detection. We know it's not pleasant to watch with human eyes. The only reason why we are not sending it at a higher frame rate is it would take a lot of network bandwidth and start to cause problems for the users who don't have high-end wifi routers and a good internet connection.
If you want a smoother camera feed, you can install Octoprint Anywhere plugin.