Thanks Ria
What is it: Allows you to check if the server supports Persistent Connection. You can check a single website or multiple URLs in one go using the BULK mode.
You can also see the version of HTTP supported by your server.
Price: FREE
Why should you care: Persistent Connection helps with the performance of your website. It can help improve your page load time which can help with your SEO efforts. That said don't expect to go from Rank 30+ to rank 1 by just enabling Persistent Connection on your server. 😉
tl;dr Marketing