I have checked the services, CPU and I have noticed that indeed it is
sqlservr.exe that grabs the attention of my CPU (the next screenshot shows a short peak in
sqlservr's CPU usage).
It happens regularly as in the first image. But – it is a quite new installation of the system, I haven't even been working on this computer with SQL yet, I haven't install anything related to SQL either. What is
sqlsrvr is doing then?