Fetching RSS feed content asynchronously or after specified time interval

i have included couple of RSS feeds on a page. But when i go to that page that takes lot of time to load(around 20 secs). I understand that it
is happening becuase of inclusion of RSS feed. I think what happens is everytime i click on that page, it brings the fresh content
from RSS subscribed sites. My question is can we configure the time frequency so that RSS feeds are fetched after certain specified
time not everytime on click of that page. It will improve the performance a lot.

Here is my code that included RSS feed under tabs.If we can specify the time frequency ,it would be great. If it is not possible
can we bring the RSS content of only site mentioned under first tab. Now if user further clicks on second tab, content for that rss
feed is fetched that time itself instead of fetching contents of all rss feed sites at a time(or if we can make the fetching
RSS feed contents asynchronously it would be amazing without imapceting page loading).

{{tabs idsToLabels="tabId1=Martin Fowler, tabId2=Coding Horror"/}}

(% id="tabId1" %)
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{{box cssClass="tabId1div"}}{{/box}}

{{rss feed="http://martinfowler.com/feed.atom" content="yes" width="100%"/}}
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(% id="tabId2" %)
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{{box cssClass="tabId2div"}}{{/box}}

{{rss feed="http://feeds.feedburner.com/codinghorror/" content="yes" width="100%"/}}
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Reply from Vincent on the mailing list is:

"Yes, modifying the RSS macro so that it loads the content asynchronously would be awesome! You should create a jira about it (and propose a pull request? )."