[optymizer1]

I find the JSON benchmark misleading a bit. I posted this before, but I'll say it again: JSON serialization in Go is slow (2.5x slower than Node.js for example [1]). The web server, however, is very fast. When they measure webserver+json, Go wins because of its webserver, not because it serializes JSON faster. If you want to parse a lot of JSON objects with 1 request (or 1 script), or if you have a large JSON object to parse, Node.js will outperform Go.

That said, I rewrote my app in Go and I'm very happy with the performance, stability and testability. The recently announced go 'cover' tool is very useful and a breeze to use.

[1] Here are my benchmarks: https://docs.google.com/spreadsheet/ccc?key=0AhlslT1P32MzdGR... (includes codepad.org links to the source for each benchmark)

[bradfitz]

I optimized the Go JSON serialization in Go 1.2. See https://code.google.com/p/go/source/detail?r=5a51d54e34bb ... it went from 30% to 500% faster. It uses much less stack space now, so the hot stack splits are no longer an issue (also Go defaults to 8KB stacks for new goroutines now).