continuously uses CPU resources

[furrnace]

as far as I understood the concept of this container, it uses firefox in a cron job to execute the breitbandmessung test.
the container uses CPU resources all the time, not only when the cron job runs.
what is the reason?

I tried the breitbandmessung-node container, but it does not export to influxdb. I do need the export to influxdb.