Perl's regex matching is faster than Go's, last I checked. At my work, we have a few large perl (and python) legacy codebases that are processing billions of messages a day. We are replacing them with far more performant Go. It is great to work with a senior Perl guy who can slam out solutions way faster than I can in any other language. However, for us, concurrency (and readability) is important. I like perl's AnyEvent better than python's Twisted, and python's Gevent better than both of those (in general). But these are nowhere near as awesome as Go's native concurrency primatives.