Surge
Surge generates and serves static HTML files for your WordPress site, causing quicker requests, faster load times and a shorter time to first byte (TTFB). Surge does not require configuration, and has no options. It works out of the box on any well-configured hosting platform. Cached files are stored on disk, and automatically invalidated when your site is updated. In various load tests, Surge has shown to easily handle 1000-2500 requests per second at 100 concurrent, on a small single-core server with only 1 GB of RAM. That’s over 70 times faster than a stock WordPress install.
Varnish/Nginx Proxy Caching
Complete WordPress Varnish Cache 3.x/4.x/5.x and Nginx Proxy Cache integration. This plugin handles all integration with Varnish Cache and Nginx Proxy Cache. It was designed for high traffic websites. Main features admin interface, see screenshots console for manual purges, supports regular expressions so you can purge an entire folder or just a single file supports every type of Varnish Cache implementation, see screenshots for examples unlimited number of Varnish Cache servers use of custom headers when communicating with Varnish Cache does not interfere with other caching plugins, cloudflare, etc Varnish Cache configuration generator purge key method so you don’t need to setup ACLs debugging actively maintained You can control the following from the Varnish Caching admin panel : Enable/Disable caching Homepage cache TTL Cache TTL (for every other page) IPs/Hosts to clear cache to support every type of Varnish Cache implementation Override default TTL in posts/pages Purge key based PURGE Logged in cookie Debugging option console for precise manual purges This plugin also auto purges Varnish Cache / Nginx Proxy Cache when your site is modified. Varnish Caching sends a PURGE request to Varnish Cache / Nginx Proxy Cache when a page or post is modified. This occurs when editing, publishing, commenting or deleting an item, and when changing themes. Not all pages are purged every time, depending on your Varnish / Nginx Proxy Cache configuration. When a post, page, or custom post type is edited, or a new comment is added, only the following pages will purge: The front page The post/page edited Any categories or tags associated with the page Varnish Cache / Nginx Proxy Cache is a web application accelerator also known as a caching HTTP reverse proxy. You install it in front of any server that speaks HTTP and configure it to cache the contents. This plugin does not install Varnish/Nginx for you, nor does it configure Varnish/Nginx for WordPress. It’s expected you already did that on your own using the provided config files. Inspired from the following : https://wordpress.org/plugins/varnish-http-purge/ https://github.com/dreamhost/varnish-vcl-collection/
