title: Speeding up a test with factories with an image
body: <p>I have an integration test that uses Paperclip and a factory with <code>Rack::Test::UploadedFile</code> to <code>(:create</code>) an image <code>20.times</code>.</p>
  
  <p>This test is extraordinarily slow. It took over 60 seconds to complete. I swapped out the image with one 30x smaller, and it only cut the test time by 20 seconds.</p>
  
  <p>How can I speed up this test and others like it?</p>