Jitsi-meet: internet bandwidth use

I installed Jitsi-meet on Aruba VMware cloud service (2vCpu and 4gb ram).

The problem is when I try a videocall+audio with two people Jitsi-meet use a lot of bandwidth, even if the two people set low graphics for video. With high resolution it became unusable. Or if we use videocall+audio in three people even with low resolution became unusable too.

The cause is the huge usage of bandwidth.

What is the problem ? There is any setting for lower bandwidths usage?