title: Speedup virtualenv creation with numpy and pandas
body: <p>I have multiple virtualenvs on a single machine, but all of them need numpy and pandas. I want to have seperated copies for each virtualenv, but creation of those virtualenvs takes quite some time. Is there some well defined way to precompile numpy and pandas on my machine just once and then to do something like:</p>
  
  <pre><code>pip install my_precompiled_numpy 
  </code></pre>