For static content that only changes on a set deployment schedule, you can increase your server's performance by making a very simple change! Update the web.config file's BlobCache section to:
<BlobCache location="C:\blobCache" path="\.(gif|jpg|png|css|js)$" maxSize="10" enabled="true" />
Your site will run like never before! The maxSize is in Gigabytes.
Chris