[support] Captcha and Page Cache

If we have Captcha enabled Page cache doesn't work on those pages. The bootstrap runs twice for every page load and hence the number of queries on a Captcha page is twice as much! Is there any way to call and refresh captcha without having to do a Bootstrap? <a href="http://www.netlinkindia.com">Netlink Technologies Ltd</a> I <a href="http://shyamala-drupal.blogspot.com/">blog and <a href="http://twitter.com/shyam_raj" rel="me">Twitter</a> :)