title: How to optimize the startup time of an SCons script?
body: <p>I have an SCons script that takes around 10 seconds just to find out that nothing needs to be rebuild, which feels awfully long for what is essentially a rather small project. Reading the SConscript itself takes just a second or two, most of the time is spend at the:</p>
  
  <pre><code>scons: Building targets ...
  </code></pre>
  
  <p>step.</p>
  
  <p>How can I find out what exactly <code>scons</code> is doing at this point? And what other general advise can be given on writing fast SCons scripts?</p>