title: latest node(v8.3.0) seems slower
body: <p>I have figured out that the latest released node(v8.3.0) runs much slower than an older version(v6.10.1) by running this simple test code (test.js):</p>
  
  <pre><code>var c = 10000*10000;
  var t = 0;               
  for (var i = 0; i &lt; c; ++i) {
      t += i;    
  }                        
  console.log(t);
  </code></pre>
  
  <p>Both versions of node projects were configured and built by these commands:</p>
  
  <pre><code>ns$ ./configure --debug --gdb; make
  </code></pre>
  
  <p>The test code above was executed for several times by both of the node binaries(release version) built above in this way: </p>
  
  <pre><code>ns$ time node test.js
  </code></pre>
  
  <p>For each time, the results looked like:</p>
  
  <p>For v6.10.1:</p>
  
  <pre><code>real    0m0.198s
  user    0m0.188s
  sys 0m0.004s
  </code></pre>
  
  <p>For v8.3.0:</p>
  
  <pre><code>real    0m0.488s
  user    0m0.456s
  sys 0m0.020s
  </code></pre>
  
  <p>I have learned that node v8.3.0 was integrated with the newer version of v8 engine which is said has higher performance, so I supposed that the new version of node should at least run as fast as the old one. But the test results(almost three times slower) told me I was totally wrong! Does anyone know why?</p>