how can it be that with the free Online Sitemap Generator it takes 100 seconds to crawl 500 sites, but with the Unlimited Sitemap Generator it takes more then 15 minutes (!!!) to crawl less then 500 sites! (same domain of course)
I have a few big sites with more then 20 thousand links each, it would take forever to crawl these sites!
Does anybody have the same problem, and what can i do to speed this thing up?