If you have <a href="{url-cli}">command-line</a> access to your site's server, consider using <a href="{url-wpcli}">WP-CLI</a> instead of this tool. It has a built-in <a href="{url-wpcli-regenerate}">regenerate command</a> that works similarly to this tool but should be significantly faster since it has the advantage of being a command-line tool.