I run a number of sites on a single server behind a reverse proxy, and the fastest to load is a CGI service, cgit. I use Traefik as the reverse proxy nowadays,

I run a number of sites on a single server behind a reverse proxy, and the fastest to load is a CGI service, cgit. I use Traefik as the reverse proxy nowadays, which doesn't support CGI directly, so I've bridged it with Go's net/http/cgo. Even with this extra hop, it the performance is still excellent.