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MC media read speed problem over VPN

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clarus7:
The VPN is a link between the two sites.  I believe the important factors that is affecting performance is the round trip time of the link, and the limited bandwidth available.  The ping time is ~70ms, the bandwidth available is ~110Mbps.  Whether the link is encrypted or not should be irrelevant in this context as neither Windows nor the app is aware of how this link is accomplished. 
The remote drive is mapped as a network drive (with a drive letter). 
The data that I have provided so far indicated that in certain modes, MC is not utilizing the available bandwidth to read data and in other modes it can. 
I think a WAN emulator adding the network delay should be able to verify this problem.

I have previously verified that when the server and MC is on the same local network, the problem does not exist.

JimH:
Can you try a different VPN?

clarus7:
The current use case as reported is using a site-to-site IPSec tunnel connecting the router on each site.  I want to make sure there is no misunderstanding that I'm using some third part VPN service.
So it looks like:
file server -- router -- internet -- router -- MC on Win11

I have also try to use Windows as a VPN client and connect directly to the remote site via L2TP or PPTP, result is the same.

kalston:
I am often using a (personal) VPN in a similar manner and have never faced this. But latency was like 20-40ms depending on where I was travelling to. I have an app to simulate latency though, so I guess I could try to reproduce this if I remember to.

I use OpenVPN and WireGuard only though.

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