It's mostly because most setups will use maven or gradle which do much more than just compile code. They will often pull down dependencies, check for bugs and s

It's mostly because most setups will use maven or gradle which do much more than just compile code. They will often pull down dependencies, check for bugs and style inconsistencies, run unit tests etc. If you run plain javac against a bunch of files it will compile just as fast as Go. In any case it will be in a blink of an eye.