I don't think that's true. We have been using ASP .NET Core + SignalR for everything in Notesnook[0]. It has great performance, libraries for everything out there, very good ergonomics, and a mature ecosystem. I know you can probably get more performance out of Rust or Go but I don't think rq/s benchmarks really hold up in reality. If you are running a startup, you'd probably see 1 to 2 rq/s unless you become viral.…
You may find this OSS .Net project I released recently interesting: https://github.com/stepwisehq/prosemirror-dotnet .