alphasis

<p>The widget area lists posts of the same category as the current post.<br />
This plugin requires the WP_Widget class introduced in WordPress Version 2.8.<br />
This widget works when any single Post page is being displayed.</p>
<h4>Official Page</h4>
<ul>
<li>Plugin’s Official Page : <a href="http://alphasis.info/developments/wordpress-plugins/widgets-of-posts-by-same-categories/" title="English" rel="nofollow ugc">English</a> / <a href="http://alphasis.info/2010/11/widgets-of-posts-by-same-categories/" title="Japanese" rel="nofollow ugc">Japanese</a></li>
<li>Author’s Website : <a href="http://alphasis.info/" title="alphasis.info" rel="nofollow ugc">alphasis.info</a></li>
</ul>
<h4>Options</h4>
<ul>
<li>Number of Posts to Show by Categories</li>
<li>Order By
<ul>
<li>Sort by title</li>
<li>Sort by creation date</li>
<li>Sort by last modified date</li>
<li>Sort by numeric post ID</li>
<li>Random</li>
</ul>
</li>
<li>Order
<ul>
<li>Ascending</li>
<li>Descending</li>
</ul>
</li>
<li>Creates a link to each category?
<ul>
<li>Yes</li>
<li>No</li>
</ul>
</li>
<li>Exclude (Categories)
<ul>
<li>The IDs of any categories you want to exclude, separated by commas.</li>
</ul>
</li>
<li>Separator
<ul>
<li>What to separate each category by.</li>
</ul>
</li>
</ul>
<h4>Localization</h4>
<ul>
<li>Japanese (ja) – <a href="http://alphasis.info/" title="alphasis.info" rel="nofollow ugc">alphasis</a> (plugin author)</li>
<li>Current release supports English and Japanese only.</li>
</ul>


Widgets of Posts by Same Categories

The widget area lists posts of the same category as the current post.

wphigh

<ul>
<li>Related posts displayed at the bottom of the post.</li>
<li>Generate beautiful responsive carousel slider.</li>
<li>Touch and drag the slider.</li>
<li>Provide a lot of options to set, flexible configuration appearance.</li>
<li>Display related posts via categories, tags or customize.</li>
</ul>
<p><a href="http://www.wphigh.com/portfolio/modern-related-posts" rel="nofollow ugc">Read More</a></p>


Modern Related Posts

Proof
http://i.imgur.com/YkPrFut.png
I removed it and again made a test, then it shows the site loads more quickly.



It increases the page loading time

A beautiful, modern, animated, responsive Related Posts Plugin.

Widgets of Posts by Same Categories vs Modern Related Posts