edu-clean: slow loading with rss-network.php

I'm finding my home page for the main blog loads very slowly (often taking 7-10 seconds to generate the html alone). After doing some debugging by commenting out some of the sections, I've narrowed it down to the rss-network.php section in front-left.php. If I comment out the include that calls the rss-network.php file, the home page loads almost instantly.

Is there anything I can do to make rss-network.php load/run faster? Right now, I've got it calling the wpmu sitewide feed for latest posts, and the sitewide comments feed.