How to load data faster from server with Reactjs

I am starting my web application using Reactjs as front-end, and Rails as Back-end. I see on the internet said: Reactjs rendering is too fast. But when I try using it, I see the speed render view seem slower than render in rails using loop. Below is my jsx file:

var CommentList = React.createClass({
 render: function() {
  return (
   <ul>
     {this.props.data.map(function(comment){
       return(
         <Comment content={comment.content} key={comment.id} />
       );
     })}
   </ul>
  )
 }
});

If I have over 100K data from server, it seems load slower than I use normal Rails code to render view. Am I wrong with anything? Reactjs render is faster, is it true?