IMacOS 15.3 problems - CPU check - need advice

Hello, after installing 15.3 I have performance issues, it seems like my Mac is lagging. I checked the Activity Monitor and there seems something using 97% of CPU?! What is it and is that related tot he problem? https://preview.redd.it/klyqif8sfwie1.png?width=1588&format=png&auto=webp&s=4653194d0a53947140b56b682762071199778df2