molotow

Defer Media is a plugin for speed up your website and defer not needed medias which out of the screen when page loaded. 
Then, when you scroll down the page, it will load images/videos/iframes automatically or pre-load it even if it it not visible yet (can be adjusted with Appearance Offset parameters).
This plugin will apply the following actions: 
– Defer images (standard [img] tag and also [picture] src sets) 
– Defer background images (if style=”background-image” applied for some block) 
– Defer Videos ([video], [source] tags) 
– Defer Youtube embedded videos (iframe) 
– Defer any Iframes ([iframe] tag)
You can see plugin demo on this page: 
<a href="https://joomcar.net/wp-optimize/a-lot-of-media-page/" rel="nofollow ugc">Defer Media demo</a>

Defer Media

This plugin defer images and videos loading on your site for make it faster

Liz Gannes

mailmunch

WordPress Inspector will inspect your site for speed, seo, security and performance. Your WordPress URL, Theme and Plugins are sent to https://wordpress.inspector.io where we run different benchmarks and tests on your WordPress and tell you how it performs.
Includes a complete security and exploit scanner which scans your WordPress for potentially broken plugins or themes. Removing broken plugins is a big win in maintaining a high performance WordPress site.
<h4>Features</h4>
<ul>
<li>Speed: Checks for issues causing slow speed</li>
<li>SEO: Checks for any issues causing SEO rankings to drop</li>
<li>Security: Tests your WordPress for vulnerabilities and security issues</li>
<li>Performance: Tests performance of your WordPress</li>
<li>Theme: Tests your theme for any security issues</li>
<li>Plugins: Identify broken plugins or themes 
WordPress Inspector includes a scanner which will look for broken plugins and themes and recommend you alternatives. It will also give you recommendations to improve performance.</li>
</ul>

WordPress Inspector

I ran this on a site that I already knew was terrible and  the analysis was that it was awesome.
I don't know what this plugin is supposedly analyzing, but it definitely isn't anything in-depth



Mediocre at best

Inspect your WordPress for speed, seo, security and performance. Find broken plugins and themes that affect your WordPress performance.

Defer Media vs WordPress Inspector