Cache is basically a component used for storing data transparently for fast processing of requests. Data stored in cache can be the computed values or duplicates of original values stored somewhere else. If data is stored in the cache then requests are served simply by reading the cache which is comparatively faster. This tutorial explains you how you can enable cache for Gravatars of your WordPress site.
With new WordPress plugin called Comment Auto Blacklist automatically adds IPs of spam comments to comment blacklist settings field in your WordPress site.
By default AJAX editing is only possible in admin area’s all comment’s quick edit option; now this tutorial explains how you can add a quick and powerful AJAX editing front-end feature for your website users. Simply install and activate WP Ajax Edit Comments plugin; soon after activation you can start editing comments on front-end using this plugin’s AJAX edit feature. Not only this much but this plugin provides you a plenty of the options and features that you can configure from your admin area dashboard’s AEC (AJAX Edit Comments) menu.
By toggling the visibility of WordPress comment form it comes visible only when a user clicks the comment button on single post pages. You can easily show/hide comment form via AJAX by using Show/Hide Commentform plugin, the plugin works with all WordPress and BuddyPress powered themes and there are no configuration options to set.