I did look at the system requirements, which are vague:
" * The PHP XML generator will work with PHP 4.3.x or higher in default configuration in Apache web-server environment.
I believe that's what I've got, otherwise, presumably, it wouldn't run at all.
* Sitemap generator connects to your website via http port 80, so your host should allow local network connections for php scripts (this is default configuration)
* For file permissions requirements please refer to "Installation" section.
No problem there.
* The memory size requirements (as well as the time required to complete sitemap generation) depends on the number of pages your website contains. "
I have fewer than 1000 pages total in my site but I can't even get a crawl even up to 500, it gets stuck here:
Links depth: 2
Current page: vlog/test2.html
Pages added to sitemap: 90
Pages scanned: 100 (2,043.3 Kb)
Pages left: 559 (+ 185 queued for the next depth level)
Time passed: 0:24
Time left: 2:18
Memory usage: -