title: What is the fastest Java Image Reader
body: <p>I have a program where I have to serialize a BufferedImage to disk and then read it back in.  Currently I'm using a raw image format </p>
  
  <pre><code>ImageIO.getImageReadersByFormatName("raw");
  </code></pre>
  
  <p>After a lot of testing it seems it's performance varies wildly on the same data (from under a second to 15 seconds).<br>
  1.  Any idea what is going on to cause this?<br>
  2.  What is the fastest Image reader/writer in Java to accomplish this task?<br></p>
  
  <p>Thanks</p>