Was using Tony's ROV for some testings and found this to be happening:
Taking a look at the processes on System Information, it was clear that from time to time all (?) processes were doubling in CPU usage:
I've killed MCM (the process using the most CPU) to make sure it was not it, and indeed it was not, as can be seen in the plot, as the surge still happens. This is the System Information CPU page after killing MCM:
It looks like it is Kraken who's causing this. @Williangalvani suggested it could be a problem related to log ingestion from extensions by Zenoh.