Intensive Related Posts Filtering

Hi. Thanks for taking the time to read this.

So I’m creating a new website (it isn’t up yet, though I do have other sites like GamePlayersReview.com).

The new site I am designing is an IMDB style site for fiction.

Essentially, I would like to create product pages that interlink via tags. So at the bottom of each post there would be a link to other posts, with posts that share the most tags being shown first. I can achieve that with YARPP. However, YARPP seems to perform the database queeries everytime the page is loaded. While I do think YARPP is a fantastic plugin, the extensive useage I require would lead to a slow site. So my first question is, how can I perform those queeries only when I create or save a post, rather than every time the page is loaded? Can I do that with YARPP? Is there an alternative plugin?

My second queery, again regarding those related posts. I would like the user to be able to filter the related posts based on categories (the AJAX style post filtering where the page is not reloaded). Beautiful Taxonomy Filters plugin is a great example of that. But is it possible to combine related posts with those filters, such that the end user can filter the related posts?

My apologies for the length of this question. And sincerest thanks for all the help.