alphasis

<p>This Plugin will display the related posts list via categories.<br />
It can automatically display the related posts list after the content of any single post of selected post types by options.<br />
There are many options for the display, order, exclusion and post-type selection.<br />
This plugin works when viewing a post of selected post types by options.<br />
This plugin requires jQuery 1.6 or higher.</p>
<h4>Official Page</h4>
<ul>
<li>Plugin’s Official Page : <a href="http://alphasis.info/developments/wordpress-plugins/related-posts-via-categories/" title="Plugin's Official Page in English" rel="nofollow ugc">English</a> / <a href="http://alphasis.info/kaihatu/wordpress-plugins/related-posts-via-categories/" title="Plugin's Official Page in 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> (Japanese) » <a href="http://alphasis.info/developments/wordpress-plugins/" title="WordPress Plugins" rel="nofollow ugc">WordPress Plugins</a> (English)</li>
</ul>
<h4>Related Posts via Categories – Options</h4>
<p>‘Settings’ » ‘Related Posts via Categories’</p>
<h4>Display</h4>
<ul>
<li>Auto display
<ul>
<li>This option automatically displays related posts after the content on the single post page.</li>
<li>If this option is off, you will need to manually insert <code>display_related_posts_via_categories()</code> into your theme files.</li>
</ul>
</li>
<li>Maximum number of related posts
<ul>
<li>If you do not enter anything: 10</li>
</ul>
</li>
<li>Related posts title
<ul>
<li>For example: Related Posts</li>
</ul>
</li>
<li>Before related posts title and related posts
<ul>
<li>For example: <code><div id="related-posts-via-categories"></code></li>
</ul>
</li>
<li>After related posts title and related posts
<ul>
<li>For example: <code></div></code></li>
</ul>
</li>
<li>Before related posts title
<ul>
<li>For example: <code><h2 id="related-posts-via-categories-title"></code></li>
</ul>
</li>
<li>After related posts title
<ul>
<li>For example: <code></h2></code></li>
</ul>
</li>
<li>Before related posts
<ul>
<li>For example: <code><ul id="related-posts-via-categories-list"></code></li>
</ul>
</li>
<li>After related posts
<ul>
<li>For example: <code></ul></code></li>
</ul>
</li>
<li>Before each related post
<ul>
<li>For example: <code><li class="related-posts-via-categories-item"></code></li>
</ul>
</li>
<li>After each related post
<ul>
<li>For example: <code></li></code></li>
</ul>
</li>
</ul>
<h4>Order</h4>
<ul>
<li>Order By
<ul>
<li>Related Scores : High  ( Speedy ) </li>
<li>Related Scores : High / Date Published : New ( Default setting )</li>
<li>Related Scores : High / Date Published : Old</li>
<li>Related Scores : Low / Date Published : New</li>
<li>Related Scores : Low / Date Published : Old</li>
<li>Related Scores : High / Date Modified : New</li>
<li>Related Scores : High / Date Modified : Old</li>
<li>Related Scores : Low / Date Modified : New</li>
<li>Related Scores : Low / Date Modified : Old</li>
<li>Date Published : New</li>
<li>Date Published : Old</li>
<li>Date Modified : New</li>
<li>Date Modified : Old</li>
</ul>
</li>
</ul>
<h4>Exclude</h4>
<ul>
<li>Exclude (Posts)
<ul>
<li>The IDs of any posts you want to exclude, separated by commas.</li>
</ul>
</li>
<li>Exclude (Categories)
<ul>
<li>Select checkboxes of any categories you want to exclude.</li>
</ul>
</li>
</ul>
<h4>Post types</h4>
<ul>
<li>Select checkboxes of any post types you want to include in the list of Related Posts and display the list.</li>
<li>Displays checkboxes of them when there is any custom post types.</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>Persian (fa_IR) – <a href="http://qanal.ir/" title="Omid Sheerkavand" rel="nofollow ugc">Omid Sheerkavand</a></li>
<li>Armenian (hy_AM) – <a href="http://ablog.gratun.am" title="Artak Kolyan" rel="nofollow ugc">Artak Kolyan</a></li>
<li>Current release supports English, Persian, Armenian and Japanese.</li>
</ul>


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.

Related Posts via Categories vs Modern Related Posts