nigro.simone

Speed Up – Page Cache was constructed for made caching dead simple. Simple one-click install. That’s it.
When a page is rendered, php and mysql are used. Therefore, system needs RAM and CPU. 
If many visitors come to a site, system uses lots of RAM and CPU so page is rendered so slowly. In this case, you need a cache system not to render page again and again. Cache system generates a static html file and saves. Other users reach to static html page.
After a html file is generated your webserver will serve that file instead of processing the comparatively heavier and more expensive WordPress PHP scripts.
The static html files will be served to the vast majority of your users: 
– Users who are not logged in. 
– Users who have not left a comment on your blog. 
– Or users who have not viewed a password protected post. 
99% of your visitors will be served static html files. One cached file can be served thousands of times.
In addition, the site speed is used in Google’s search ranking algorithm so cache plugins that can improve your page load time will also improve your SEO ranking.

Speed Up – Page Cache

A very simple plugin to make your site run lightning fast with page caching.

Zack Tollman

Purgely manages caching behavior for WordPress sites using Fastly as an edge caching solution. The plugin exposes useful 
APIs to help control how pages on your site are cached, as well as provides sane defaults to make this a plug and play 
solution for Fastly cache management.
The plugin handles the following:
<ul>
<li>Sets the <code>Surrogate-Control</code> header to control the expiration time for pages</li>
<li>Sets the <code>stale-while-revalidate</code> and <code>stale-if-error</code> <code>Cache-Control</code> directives for managing these special Fastly 
behaviors</li>
<li>Set groups of <code>Surrogate-Keys</code> for all pages to provide purging across multiple pages with one command</li>
<li>Provides invalidation of posts and related posts on save</li>
</ul>
Each of these items have sane defaults with ways to override them and configure them to your liking.
Additionally, the plugin exposes a WP CLI command to provide more flexible purging options.

Purgely

A plugin to manage Fastly caching behavior and purging.

Speed Up – Page Cache vs Purgely