Less than 40 lines of php code so it will not slow your site and if all you
need is to add an rss feed, give it a try.
You can even setup the output template – something many other plugin don’t
offer.
short code examples:
[rss url="http://www.usacycling.org/rss/headlines.rss"]
[rss url="http://www.usacycling.org/rss/headlines.rss" no="20" target="_self"]
You can change the template used via wp-admin/options.php , look for
'rss_shortcode_template'
Template fields documentation:
_TITLE_ : the rss feed title line
_LINK_ : the link to the complete store, aka permalink
_MSG_ : the short message/description; the first few
lines of the post/story
_DATE_ : post date & time
_TARGET_ : the link target