I have a question for veeam backup speed, some time veeam backup It's been too long....

most of the time for Busy:
Busy: Source 99% > Proxy 0% > Network 49% > Target 49%
And this is VM architecture:
Dell server + Dell Storage by 10G Fiber
Veeam in a stand alone server .
This is my backup time :
AM 01:35:01 ~vAM 10:07:46 (+2)
Size:14.1 TB
Read:13.3
Transferred:TB 38.1 GB
Duration:56:32:45
This is another VM backup time :
AM 02:06:38 上AM 07:29:49 (+1)
Size:12 TB
Read:6 TB
Transferred:29.1 GB
Duration:29:23:10