mabujo

Featured Image Sharpen Up makes a tiny version of your featured post image and places it in the head of the page. 
As you scroll down the page, some JavaScript lazy loads the featured images in the background and replaces the tiny images as the full images are loaded.
You may have seen a similar effect used for images on medium.com.
Created on WordPress 4.4, but should work on earlier versions. 
Tested working on all Twenty Sixteen, Twenty Fifteen, Twenty Fourteen, Twenty Thirteen, Twenty Twelve and Twenty Eleven themes. Should work on other themes, but may need CSS adjustments, depending on theme handling of featured images.
Uses jQuery.Lazy(); (http://jquery.eisbehr.de/lazy/) and Hugh Lashbrooke’s plugin template (https://github.com/hlashbrooke/WordPress-Plugin-Template)
Plugin page : <a href="https://mabujo.com/blog/featured-image-sharpen-up-wordpress-plugin/" rel="nofollow ugc">Featured Image Sharpen Up plugin @ mabujo</a>

Featured Image Sharpen Up

This plugin helps increase the page loading speed of your site by replacing featured post images with a small inline image, and lazy loading the full  …

OptimizeWP

Google has been using pagespeed as a ranking factor since 2010 . And in 2018, Google raised the bar with the Pagespeed update . Website speed affects user experience and conversion rates.
Why is the web speed slow, SEO rankings decrease? Page load speed is determined by various factors, including web code optimization, Hosting/Server Cache and image optimization.
This plugin will do Optimize & Speed ​​Up WordPress Website as bellow:
<ul>
<li>Minify Javascript and CSS</li>
<li>Create & Optimize Critical CSS</li>
<li>Optimize Google Fonts</li>
<li>Optimizing Lazy-loading</li>
<li>Enable Gzip compression</li>
<li>Remove render blocking resources</li>
<li>Reduce HTTP requests</li>
<li>Advanced Web-App optimization techniques</li>
<li>PageSpeed ​​Insights >90-100 (95% URLs, Mobile & PC) 
Core Web Vitals (LCP, FID and CLS) improve gradually after 28 days Validate the fix.Percentage pass depends on Device & User Network.</li>
<li>Improved web speed</li>
<li>No broken interface layout, no loss of image quality, no feature conflicts</li>
<li>Update theme/plugin does not reduce Pagespeed</li>
</ul>
Social: <a href="https://www.youtube.com/channel/UCPNgZ3jIwawHlu_iBN1Pa8A" rel="nofollow ugc">Youtube channel</a> 
User manual: <a href="https://tailieu.wp2speed.com" rel="nofollow ugc">https://tailieu.wp2speed.com</a> 
Developer: <a href="https://docs.wp2speed.com" rel="nofollow ugc">https://docs.wp2speed.com</a>

WP2Speed Faster – Optimize PageSpeed Insights Score 90-100

WP2Speed ​​is a Google PageSpeed ​​Insights speed optimization plugin. Use it to speed up your WordPress site, improve SEO rankings, and reduce Google …

Featured Image Sharpen Up vs WP2Speed Faster – Optimize PageSpeed Insights Score 90-100