[deaddodo]

That's a little disingenuous. h2o isn't really a framework as much as it is a server that can be extended as an application (Similar to CherryPy vs Flask/Django). There aren't really any good C web frameworks, and any web applications built in C are very likely to be bespoke code utilizing some HTTP library (libhttp, h2o, kore, etc).

Actix is a framework, built in Rust and non-GC'd, that performs significantly better than any of the Go frameworks. So GC does seem to have some effect.

That being said, I agree the GC is unlikely to be the problem for D's performance (in this case).