I think I found something here: VDP CPU Usage
It seems like the appliance is doing Read Checks on the backup storage destination every 5 minutes (300 seconds) and that is normal behavior according to VMware.
Thing is that 1.5GB of data (in my case) every 5 minutes is not acceptable as it might alter bandwidth utilization.
I logged in the console of vdp and applied to command but with interval 0.
I found another post here: VDP Now uses constant bandwidth even during blackout period
They say that the maximum interval available is 3600 seconds which is an hour. That's better than 5 minutes but it looks like the 0 parameter is accepted by the appliance and no error is reported.
I will update in more than an hour to see if it works because at first, I applied the 3600 and my graphs shows the changes applied.
It is 8:20am here so I will be back after 9:30 to make sure the hour passed.