title: Why is my Symfony 2.0 site running slowly on Vagrant with Linux host?
body: <p>I've got a Symfony 2.0 application running using Vagrant with a Linux guest and host O/S (Ubuntu).  However, it runs slowly (e.g. several seconds for a page to load, often more than 10s) and I can't work out why.  My colleagues who are running the site locally rather than on Vagrant VM have it running faster.</p>
  
  <p>I've read elsewhere that Vagrant VMs run very slowly if NFS isn't enabled, but I have enabled that.  I'm also using the APC cache to try and speed things up, but still the problems remain.</p>
  
  <p>I ran xdebug against my site using the instructions at <a href="http://webmozarts.com/2009/05/01/speedup-performance-profiling-for-your-symfony-app" rel="noreferrer">http://webmozarts.com/2009/05/01/speedup-performance-profiling-for-your-symfony-app</a>, but I'm not clear where to start with analysing the data from this.  I've got as far as opening it in KCacheGrind and looking for the high numbers under "Incl." and "Self", but this has just shown that <code>php::session_start</code> takes quite a long time.</p>
  
  <p>Any suggestions as to what I should be trying here?  Sorry for the slightly broad question, but I'm stumped!</p>