The CDN rewrites

At what point does VBSEO rewrite the urls for the CDN?

Does it wait until the whole page has been created by VB, then rewrite all the links, or does it rewrite the template before they are compiled into the page?

For example - if the standard forumhome_level1_post.txt has 5 images to rewrite (as a base template) and appears 50 times on the page - is it rewritten 5 times or 250 times?

vbseo works by pre-processing everything, then passing it to the standard vb script. in your case, the template would have 5 calls on it.