If anything, the article proves that when you want performance don't use Node.js - or more generally, abstractions have a cost. The actual library, as already

If anything, the article proves that when you want performance don't use Node.js - or more generally, abstractions have a cost. The actual library, as already pointed out, is written is C/C++ and bypasses Node for everything, other than providing an usage API layer. Its the same as claiming that Tensorflow is written in Python ;)