title: Which JS benchmark site is correct?
body: <p>I created a benchmark on both jsperf.com and jsben.ch, however, they're giving substantially different results.</p>
  
  <p>JSPerf: <a href="https://jsperf.com/join-vs-template-venryx" rel="noreferrer">https://jsperf.com/join-vs-template-venryx</a><br>
  JSBench: <a href="http://jsben.ch/9DaxR" rel="noreferrer">http://jsben.ch/9DaxR</a></p>
  
  <p>Note that the code blocks are exactly the same.</p>
  
  <p>On jsperf, block 1 is "61% slower" than the fastest:
  <img src="https://i.imgur.com/uBpTfNY.png" alt=""></p>
  
  <p>On jsbench, block 1 is only 32% slower than the fastest: ((99 - 75) / 75)
  <img src="https://i.imgur.com/btPgZ7E.png" alt=""></p>
  
  <p>What gives? I would expect benchmark sites to give the same results, at least within a few percent.</p>
  
  <p>As it stands, I'm unable to make a conclusion on which option is fastest because of the inconsistency.</p>
  
  <p><strong>EDIT</strong></p>
  
  <p>Extended list of benchmarks:</p>
  
  <ul>
  <li><a href="https://jsperf.com/join-vs-template-venryx" rel="noreferrer">https://jsperf.com/join-vs-template-venryx</a></li>
  <li><a href="https://jsbench.me/f3k3g71sg9" rel="noreferrer">https://jsbench.me/f3k3g71sg9</a></li>
  <li><a href="http://jsbench.github.io/#7f03c3d3fdc9ae3a399d0f2d6de3d69f" rel="noreferrer">http://jsbench.github.io/#7f03c3d3fdc9ae3a399d0f2d6de3d69f</a></li>
  <li><a href="https://run.perf.zone/view/Join-vs-Template-Venryx-1512492228976" rel="noreferrer">https://run.perf.zone/view/Join-vs-Template-Venryx-1512492228976</a></li>
  <li><a href="http://jsben.ch/9DaxR" rel="noreferrer">http://jsben.ch/9DaxR</a></li>
  </ul>
  
  <p>Not sure which is the best, but I'd skip jsben.ch (the last one) for the reasons Job mentions: it doesn't display the number of runs, the error margin, or the  number of operations per second -- which is important for estimating absolute performance impact, and enabling stable comparison between benchmark sites and/or browsers and browser versions.</p>
  
  <p>(At the moment <a href="http://jsbench.me" rel="noreferrer">http://jsbench.me</a> is my favorite.)</p>