When the request goes through a tunnel - it took ten times slower

The problem started happening within a week or so.

We have on the server
A tunnel serving the local .net webapi service.
When the request goes through a tunnel - it took ten times slower than when it arrives directly via ip to .net

We have the exact same configuration on a few more servers and the problem started gradually on more servers and now the problem on all servers

Thanks in advance

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same here, no changes done but loading times incredible slow