no, but I could probably have worded it better. What I mean to say is that if you do this in JS:

   function add (a, b) {
     return a + b;
   }

and this in C:

  int add(int a,int b)
  {       
     return a + b;
  }

you're going to get essentially the same performance.

The latter sentence you quoted refers to the specific builtin functions that fast.js re-implements. So we first get close to native performance in JS, then we beat the builtin functions by doing less work overall.