Low speed network share windows, why?

Question

System administration

There is a server with ESXi installed and a deployed Windows Server 2019 Datacenter. There are such roles as AD DS, DNS, DHCP, NAT (routing). There is also a network drive. The crux of the matter is that on 2 physical PCs the speed is normal, even in the outside the speed is normal (100 Mbps). But with some virtual machines there is such a problem that when transferring a file through the explorer, the speed drops to 0kb / s. After a minute or two it resumes. And again falls to 0. What could be the problem?

Answer 1

Most likely a problem with the disk subsystem.
Check the speed of copying inside the virtual machine itself. Is it very different from copying on real hardware.
Doing NAT on a wine server is, of course, something else...)))

Answer 2

What could be the problem?

Probably with the fact that this is a virtual machine.
The disk subsystem in virtual machines suffers the most. Here it depends on the virtualization system, and on a bunch of other things.
From a stupid lack of resources, to suboptimal access to resources.
There may be a lack of memory for caching disk operations, and a heavy load on the physical disk, and a lack of processor, and non-optimal cluster sizes and FS settings in the virtual machine and on the host.

server with ESXi installed and deployed Windows Server 2019 Datacenter. There are such roles as AD DS, DNS, DHCP, NAT (routing).

Well, if you say without using swear words - not the best combination ....