Poor samba performence in Debian Guest in Proxmox?

Hi,
I use Proxmox 8.1.3 and installed as a guest Debian and Window Server.

I use Debian as File Server. But unfortuntely it has poor speed performance. I need to know the reason;

1- From Samba Server?
2- From my network cable, switch etc. speed/problem?
3- From Proxmox network adapter?

But I check everything is good in Proxmox summary screen all is fine.

Can you advice me about controling of this speed problem with Samba?

Regards,
Mucip