So ...

YOAST comes with many awesome built-in tools and features ...

Here is a quick overview ...

• SEO title and meta description on a per post basis
• title and meta description support for categories, tags, etc
• meta robots configuration (noindex, nofollow, etc)
• breadcrumbs with configurable titles
• advanced XML sitemaps
• directly accessible .htaccess and robots.txt editor
• RSS footer & header configuration options
• native Google Webmaster Tools, Yahoo Site Explorer, and Bing Webmaster Tools verification
• canonical support for archives, single posts and pages and the front page
• focus keyword testing
• import functionality from AIO SEO and SEO data transport functionality from various popular themes
• Google search result snippet editor with live preview

And these are free features ... Needless to say, the Premium version comes with even more features ...

OK ...

Let's start with a speed test ...

Here are my results before installing the plugin ...

... and the result after installing and activating the plugin:

As you can see, this complex and literally vital plugin is almost invisible ....

With that having said, let's see how it works ...