folder redirections makes home folders freezing explorer

Hello,

I have 2 windows server 2019 running, one is a DC, the other act as file server.

I created a GPO on the DC: User Configuration/Policies/Windows Settings/Folder Redirection, and redirected most of the folders using the root path:

\\mydomain.local\pub\home

So for many of the redirected folder, the user will have his data in for example:

\\mydomain.local\pub\home\Clair\Application Data

That root path is a shared folder using DFS on the file server.

Also on the file server, I also have another shared folder accessible through: \\mydomain.local\pub\root

All the other user machines in my domain are running windows 10.

The problem I have is on every user machines, for all users, when I try to connect to the user home folder, the explorer freeze for like a min or two. Then if I quickly browse another directory and come back to that folder, it is fine, but if I let few minutes before I browse the home folder, explorer freeze again. Making the system is barely usable.

The weird thing is the root folder, shared the exact same way, which contains 8TB and few millions files, is browsing perfectly fine.

I looked into this all over the place, it looks like many people are experiencing the same extremely annoying behavior, but I could not find a solution. I tried many things:

- sharing with or without DFS, same behavior

- in the advanced Sharing options of the home folder shared, I set "No files or programes from the shared folder are available offline".

I tried the other options too, same behavior.

- turning off SMB cache(s) options, same behavior

Using these options: https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-7/ff686200(v=ws.10)

- ran Wireshark during the freeze, but I'm no expert in it. I have like 50+ packets from the TLSV1.2 protocol taking from 0.5s to 3s

- some of the user machines are VMs, others are not, same behavior

I really don't know what to do, what to try, this is extremely frustrating, I would really need some help.

cheers

Laurent