this plugin does not seem to work when there are a large number of posts. i have a couple sites with > 200K posts. i have set the plugin to ONLY include 100 posts in the sitemap (as well as upping the memory and time limits), but it still causes a segfault. it doesn't matter if i create a new post, or manually rebuild the sitemap on the admin options page for the plugin. it runs for what seems like 5-10 seconds, then returns either a blank page or a browser error due to server resetting the connection.