Why is this js code so slow?

Posted by SpiderPig on Stack Overflow See other posts from Stack Overflow or by SpiderPig
Published on 2012-07-02T03:12:14Z Indexed on 2012/07/02 3:15 UTC
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This code takes 3 seconds on Chrome and 6s on Firefox. If I write the code in Java and run it under Java 7.0 it takes only 10ms. Chrome's JS engine is usually very fast. Why is it so slow here? btw. this code is just for testing. I know it's not very practical way to write a fibonacci function

fib = function(n) {
  if (n < 2) {
    return n;
  } else {
    return fib(n - 1) + fib(n - 2);
  }
};

console.log(fib(32));

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