Please Help a Complete Newb with Slow/Stalling File Transfers

I just set up a new NAS, first time, I got the server installed and set up and have a RAID Z1 pool of 6x12tb drive (server is an AMD 5700g with 64gb RAM) and all that seemed to go well but when I try to do a file transfer from my windows computer to the mapped folder/drive I have problems, small files from 300mb to 1.5gb seem to do ok and transfer at about the network speed (60-100MB/s) when I try to transfer a 5gb or larger file it almost instantly chugs down to 300KB/s to around 1.5MB/s often sitting at 0KB/s. Windows has also errored out on the transfers

I have no idea where to begin troubleshooting this, complete linux newb outside of copy/pasting stuff for 3D printer firmware (klipper). Anyone willing to hold someone’s hand?

Want to provide hardware spec on truenas server and maybe windows computer?

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Sorry, I thought I had, I’ll be more detailed.

Server:
AMD 5700g, 64gb DDR4 RAM, 512mb WD M.2 boot drive, MSI MPG B550 Gaming Plus motherboard, using onboard NIC and SATA ports, six HGST - WD Ultrastar DC HC520 HDD | HUH721212ALE601 | 12TB 7200RPM SATA drives.

Windows PC:
AMD 9600x, 64GB DDR5 RAM, 4tb WD M.2, X870 Aorus Elite WIFI 7 motherboard using onboard NIC

It looks like you’re running an old electric eel version 24.10.0. Please update to 24.10.2 and see if issue persists.

I was hoping that wouldn’t come up, lol. I’m actually running HexOS but community support is still slow on that end. If you’re not familiar HexOS is a skin OS that runs TrueNAS Scale and sits on top and lets you make folders and users super easily without having to mess with (or understand) permissions etc. I can’t really update the version of Truenas without possibly breaking something in HexOS.

me personally, have a spare INTEL NIC lying around - install that and try that out instead of using REALTEK NIC on board. it just a suggestion.

This is definitely a network problem yes?

I have an Intel NIC ordered, I’ll let everyone know how it turns out.

Success!!! Who new I would have to throw money at it to fix it, lol. Got a steady gig of transfer speed now! Can a moderator edit the title to shows solved or something? Thanks everyone!

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Hopefully you didn’t spend too much for a Intel NIC. You never know, next thing I will be forcing you to do is buy another INTEL NIC for that windows machine!?

Well I popped about $50 for a duel port X540 10g card, lol