Low speed on SMB - QES

Hi everyone. After struggling with this issue for a few days, we’ve found a partial solution. First, I should mention that we rebooted the ES1686DC R2. We created various pool and RAID configurations with every possible shared folder setup. We changed the switches, the settings on the switches, as well as the cables and client computers. In addition, a second NAS, the TS-h1277AXU-RP, was connected to the network the entire time, and it has been utilizing the full network speed (10Gbps) without the slightest issue.

Together with the team, we discovered an interesting situation. After using the command
to disable the SMB signature on the client side, i.e.,

Set-SmbClientConfiguration -RequireSecuritySignature $false

the speed increased from 200MB/s to 650MB/s. However, we are still unable to fully resolve the issue. Has anyone else encountered a potential issue related to SMB signing?

I’ll add some information regarding the client computers.
Windows 11 Pro (25H2)
ASUS ProArt X870E
AMD Ryzen 9 9950X
192GB RAM
Network Card: Aquantia/Marvell AQC113 FastLinQ Edge 10Gbit Network Adapter
Drives: 3x Samsung SSD 9100 PRO 4TB