@Sebastian-Roth I already did defrag but without success. Thx

Thanks for the informations! My network is GLAN certified end to end, but I realized that I got 6Gb/m on the sda4 partition, while I get miserable 3Gb/m on the sda2 partition, any more ideas to help me? Picture below.

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We had a FOG server in VMware that delivered 9 Gb/m but we need to migrate to VM and now the transfer rate is no more than 3 Gb/m, even connecting the direct host to the server does not increase the transfer rate.

System:
Fog 1.5.4
VirtualBox 5.2.20
Debian GNU / Linux 9 (stretch)

CPU Type GenuineIntel
CPU Count 4
CPU Model Intel Xeon CPU E3-1220 v3 @ 3.10GHz
Total memory 6.07 GiB

Intel Pro / 1000T NIC, HP 1Gb Ethernet

I already changed from GZIP to ZSTD and had no effect.

Edit: I already tested with IPerf and gave 1Gbps

I went through exactly this problem on my network, I use a Cisco Catalyst 2960 X, which solved it was to configure spanning-tree on all ports, and configure portfast on all but the trunk port (since we use more than one DHCP here). Good Luck!