title: Amazon S3 High CPU Usage
body: <p>I'm using the PHP SDK of Amazon S3 to upload huge compressed files to the bucket.</p>
  
  <pre><code>$s3 = S3Client::factory(array(
      ...
  ));
  
  $uploader = new MultipartUploader($s3, $file, array(
      'bucket' =&gt; $bucket,
      'key'    =&gt; $filebase
  ));
  
  $result = $uploader-&gt;upload();
  </code></pre>
  
  <p>However, this is taking a high CPU usage, causing my website to be slow at those times.</p>
  
  <p>Is there any way I can use some kind of "ionice", or control the upload rate, so that it doesn't impact the performance with my users?</p>