Web Guy

Caching for a snappier website.
When a WordPress page loads normally, it goes through:
<ol>
<li>PHP execution</li>
<li>Database queries (often 20-50+ queries)</li>
<li>Theme processing</li>
<li>Plugin execution</li>
<li>HTML generation</li>
</ol>
With Snappy file-based caching, it skips all that and just serves a static HTML file.
Estimates for performance improvement:
<ul>
<li>2x faster is conservative and achievable for most sites</li>
<li>5x faster is realistic for database-heavy sites</li>
<li>10x faster is possible for poorly optimized sites with many plugins</li>
</ul>

Snappy

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.

Snappy vs Purgely