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This is a very simple dashboard widget that will load every time your dashboard loads. It will submit your feed to an online feed validator, grab the response and update your dashboard with the results.
It’s best to know immediately that your RSS feed is invalid. Sites such as Bloglovin’ and Google Reader will not add your posts to their sites if your RSS feed is invalid. Knowing there is an issue is the first step in resolving the issue!
Most invalid RSS feeds are caused by some html you’ve used in your post. This widget is not intended to fix your feed, it is just a notification that there may be an issue with your feed.
This plugin requires cURL to work. cURL is a php library that allows HTTP requests to be sent. This is a core feature of the plugin. The good news is, most online hosting providers have cURL setup and installed for you already. If you install this and the widget displays an error of some sort, you probably have an issue with cURL.
Homepage for the RSS Feed Validator is: http://www.thenerdnest.com/rss-feed-checker

RSS Feed Checker

This widget will submit your wordpress RSS feed to feedvalidator.org, and check the results to verify your feed is valid.

DareBoost

Performance Tester is a WordPress plugin that allows you to launch a performance and quality analysis on your WordPress home page directly from your backoffice. 
The report is provided by <a href="https://www.dareboost.com" rel="nofollow ugc">DareBoost</a>.
Easily launch an analysis and get :
<ul>
<li>Major metrics of web performance (loading time, page weight) and DareBoost score</li>
<li>Relevant performance timings (first byte, page interactive, page fully load)</li>
<li>3 improvement priorities to optimize your WordPress</li>
<li>A direct access to a full report on <a href="https://www.dareboost.com" rel="nofollow ugc">DareBoost</a>, with all your issues and recommandations to optimize your website (for free)</li>
</ul>

Performance Tester

Analyze the home page of your WordPress site directly from your backoffice and get a quality and performance report.

RSS Feed Checker vs Performance Tester