Jitsi-hammer issue (stress test)


I’m trying to use n istances of jitsi-hammer to understand the amount of bandwidth used by the system.
in my initial test I want to use 10 users and I’m expecting that the total bandwidth is proportional to the number of clients.
with only one client I have, more or less, 500kbps.
I’m expecting, with 10 users, 10x500kbps.
In my case I have, with 10 users, 1Mbps.

is there an option that I have to enable the stress test?
Thank you very much