title: Please explaining this Symfony2 vs ZendFramework 2 performance results
body: <p>We are benchmarking Symfony2 with Doctrine2 vs. ZendFramework2 with Doctrine2.</p>
  
  <p>The test consisted in a bare ZF2 and SF2 Hello World for baseline Vs. the same but with Doctrine2 loading a simple object. We used ab and measured only the requests per second and time per request. </p>
  
  <p>During the bare framework test Hello World ZF2 performed much better than SF2 almost 2x as better.</p>
  
  <p>However when we did the same test but adding Doctrine2 into the mix the results were inverted. SF2+D2 behaved 2x fast as ZF2+D2.</p>
  
  <p>We have skills in-house for both Symfony2 and for ZendFramework so we could go for either or, and we are not concerner about RAM usage as we can always get more RAM. But we do care about performance and we need helping the best tool.</p>
  
  <p>Some ideas:
  - We believe S2 is doing some sort of caching
  - We believe ZF2 Doctrine2 ORM Module might be the cause
  - We are unsure as to what type of caching to use in production? APC?Xcache? etc. </p>
  
  <pre><code>Framework + Doctrine loading an object      
  Concurrent:100 / Connections: 1000      
      Resp. T ms  Req. Sec
  ZF2        60   16
  S2         31   32
  
  Framework + Doctrine loading an object      
  Concurrent: 25 / Connections: 150       
      Resp. T ms  Req. Sec
  ZF2         57  17
  S2          30  32
  
  
  ======================
  
  Framework Bare      
  Concurrent: 100 / Connections: 1000     
      Resp. T ms  Req. Sec
  ZF2         10.5    94
  S2          15.3    65.36       
  
  Framework Bare      
  Concurrent: 25 / Connections: 150       
      Resp. T ms  Req. Sec
  ZF2         10  98
  S2          15.4    64
  </code></pre>