JIRA should filter what it downloads by column names

It seems that the JIRA downloader is asking for all the fields when downloading issues from JIRA. I noticed this when our builds were taking longer then usually and found it was due to our JIRA instance being slower then usual.

When attempting the download manually, I see this in the comment sections,

RSS generated by JIRA (5.2.5#847-sha1:7fd7dd6f72035074370cfd27de760a25c1261256) at Thu Apr 18 16:16:01 CDT 2013

It is possible to restrict the fields that are returned in this document by specifying the 'field' parameter in your request.
For example, to request only the issue key and summary add field=key&field=summary to the URL of your request.