The Kestrel HTTP server included in ASP.NET was using libuv (async event loop implemention used also in nodejs) for a while (it is removed now and replaced with the managed `Socket` implementation. Since libuv is native code, they had a lot of PInvokes/DllImport in their glue code. The performance was way ahead of what they had in their IIS implementations, so I think you will be good performance wise.