Your settings in general seem fine for your hardware, but you have quite a big amount of further sources in your scene. Alerts, Overlays?, etc. which could be eating up resources.
I would recommend to create a new Scene Collection and for example only add your Elgato for the moment, and then test with that. If everything works fine, add your webcam, test again, then add further sources to see if its a special source or the combination of all the sources.