I am having a similar problem. On my network segment I have two computers connected to the (CRS305-1G-4S+IN) [IN SwitchOS Mode], then the switch is connected to the rest of the network via the 1GB “Console Port”. All cables are CAT6 directly attached to the computers and in the switch I have 2X 10GTek 10GBASE-T modules. (Ports 2 and 4, for temps)
Computer 1 is a Ryzen 9 3900, 64gb RAM with PCIe v4 NVME drive running Win10
Computer 2 is a 8 core AMD, 16gb RAM, with a PCIe v3 NVME drive running UnRAID.
Running a speed test (Speedtest.net) on Comp1 I get 800-900 mbps download speed and .1 mbps upload. Also NVMe to NVMe transfers between the machines MAXES out at 3gbps going from Comp 1 To Comp 2. Comp 2 to Comp1 maxes at 1.7Gbps. None of the computers are remotely taxes by the transfer. CPU’s are under 40%
Any help is appreciated.