WordPress Performance: MySQL->XML?

Hello all,

What do people think about occasionally copying the complete wp mysql database (less the user section) into an XML file to increase post serve time?

I’m running a fairly complex site on a, sadly, fairly slow host. Because there’s too much non-WP php calculated on the page, and AJAX would seem odd if I were to use WP_Cache, I think this might be a helpful next step to investigate.

I’m not really asking for a how-to, but what roadblocks you think I might run into, and thoughts whether it would be viable at all.