I like that HardInfo has a network section.
In my case, there is a device call lo and another one called enp35s0
-Network Interfaces-
lo 0.05MiB 0.05MiB 127.0.0.1
enp35s0 78.73MiB 4.88MiB 192.168.59.101
Is it a 10 Mbps, 100 Mbps, 1 Gbps, 2.5 Gbps, 5 Gbps connection?