Second Publication 23 April, 2015
As soon as you’ve checked the checkbox and hit Save, it’ll give you some options but in most cases you won’t need those. It generates an XML sitemap for all your posts, pages, custom post types and all your taxonomies like categories and tags and (if applicable) other custom taxonomies.
When you publish a new post or page, the XML sitemap is automatically submitted to Google & Bing allowing them to easily (and quickly) find your new content.
Other than most other XML sitemap plugins, this plugin doesn’t generate a static file, which is a very intensive process, especially for large sites. This means there is no “action” on publish, which slows down the publishing of the post. Instead it generates XML sitemaps as a sort of template using WordPress rewrites, which is much faster while also allowing caching plugins to cache the output.