Jon Weatherhead

AJAX Comments Refueled allows for pages to be cached without needing to invalidate on new comments, and is useful for upgrading the default comment system to not rely on page refreshes for replying to comments.
This plugin is a zero-dependency implementation. This means that it does not require jQuery.
Image by <a href="https://pixabay.com/users/geralt-9301/?utm_source=link-attribution" rel="nofollow ugc">Gerd Altmann</a> from Pixabay.
<h3>How To Use</h3>
Simply install and activate this plugin and it will work – there are no options to fuss over.

AJAX Comments Refueled

An all-AJAX drop-in for the stock comments system.

mg12

AJAX paging plugin for comment pages in WordPress 2.7 or higher versions.
为 WordPress 2.7 的评论分页功能增加 AJAX 处理.
Features:
<ul>
<li>AJAX comment paging</li>
<li>Without any JavaScript framework</li>
</ul>
Demo:
http://www.neoease.com/themes/
Supported Languages:
<ul>
<li>US English/en_US (default)</li>
<li>简体中文/zh_CN (translate by <a href="http://www.neoease.com/" rel="nofollow ugc">mg12</a>)</li>
</ul>

AJAX Comment Pager

AJAX paging plugin for comment pages in WordPress 2.7 or higher versions.

AJAX Comments Refueled vs AJAX Comment Pager