I think there's a bit of a misunderstanding in the paragraph about C++: when people say that a programming language is "inefficient," they usually mean that programs written in that language run slowly. That is certainly not the case with C++. The link that the author of the post gives is to a stackoverflow entry that explains why the C++ compilation process is slow. That is of course a different matter. As a matter of fact, C++ aficionados often argue that the efficiency of C++ programs is the one thing that outweighs all its disadvantages, like the slow compilation process.