{"id":6128,"date":"2025-11-06T11:54:02","date_gmt":"2025-11-06T08:54:02","guid":{"rendered":"https:\/\/maniainc.com\/technology\/?p=6128"},"modified":"2025-11-06T21:35:56","modified_gmt":"2025-11-06T18:35:56","slug":"the-ultimate-server-side-caching-guide-for-wordpress-redis-varnish-and-cloudflare-enterprise-explained","status":"publish","type":"post","link":"https:\/\/maniainc.com\/technology\/the-ultimate-server-side-caching-guide-for-wordpress-redis-varnish-and-cloudflare-enterprise-explained\/","title":{"rendered":"The Ultimate Server-Side Caching Guide for WordPress: Redis, Varnish, and Cloudflare Enterprise Explained"},"content":{"rendered":"
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\n\t\t\tThis is post 17 of 18 in the series “WordPress Guides and Tutorials 2025”<\/em>\t\t<\/p>\n\t\t\t\t\t

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In-depth WordPress Guides and Tutorials for the year 2025 and beyond. In this series, we share what we have learned over the 5 years we’ve been developing WordPress sites. We cover crucial topics such as WordPress Security, improving WordPress Site Speed, WooCommerce optimization, finding the Best WordPress Hosting, and so much more. We’ll update this series frequently, so consider bookmarking it.<\/p>\n\t\t\t<\/div>\n\t\t\t<\/label>\n\n\t\t\t

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  1. Get Reliable Cloud Hosting from Cloudways – Our Recommendation<\/a><\/li>\n\t\t\t\t\t\t\t\t\t
  2. Why You Should Install WooCommerce Applications Separately from WordPress Content Sites<\/a><\/li>\n\t\t\t\t\t\t\t\t\t
  3. Choosing the Right Web Hosting Provider: A Comprehensive Guide to Finding Your Perfect Match<\/a><\/li>\n\t\t\t\t\t\t\t\t\t
  4. WordPress Starter Kit and Blogging Guide: How to Start Your New Site on a Strong Footing<\/a><\/li>\n\t\t\t\t\t\t\t\t\t
  5. How to Speed Up a WordPress Site for Technical and Non-Technical Users<\/a><\/li>\n\t\t\t\t\t\t\t\t\t
  6. WordPress vs. WP Engine Feud: Should You Move Your Site Away from WP Engine?<\/a><\/li>\n\t\t\t\t\t\t\t\t\t
  7. Free and Paid Ways to Secure WordPress: Essential Tips for Securing Your WordPress Site<\/a><\/li>\n\t\t\t\t\t\t\t\t\t
  8. How to Optimize WooCommerce for Speed and Security<\/a><\/li>\n\t\t\t\t\t\t\t\t\t
  9. Mastering Server-Level WordPress Optimizations: Proven Strategies for Blazing-Fast Performance<\/a><\/li>\n\t\t\t\t\t\t\t\t\t
  10. How to Create a Custom WordPress Website Without a Web Developer (for Less than $5)<\/a><\/li>\n\t\t\t\t\t\t\t\t\t
  11. How to Optimize Your WordPress Theme (Free or Paid) for Speed, SEO, and User Experience<\/a><\/li>\n\t\t\t\t\t\t\t\t\t
  12. Why Your WordPress Multisite Is Slowing Down \u2014 and How CPU-Optimized Hosting Can Fix It<\/a><\/li>\n\t\t\t\t\t\t\t\t\t
  13. Easy and Quick WordPress Optimizations with One-Click and One-Plugin Solutions<\/a><\/li>\n\t\t\t\t\t\t\t\t\t
  14. 5 Reasons Why Your Website Needs Managed Cloud Hosting (and Why We Think Cloudways is the Best)<\/a><\/li>\n\t\t\t\t\t\t\t\t\t
  15. Maximize ROI for your SMB Website with Cloudways’ CPU-Optimized Servers + Lightning Stack: Scale for Long-term Growth at an Affordable Price<\/a><\/li>\n\t\t\t\t\t\t\t\t\t
  16. How Cloudways CoPilot Makes WordPress Server Troubleshooting Easier and Saves You Hours (at a Fraction of the Cost of Hiring a DevOp Engineer)<\/a><\/li>\n\t\t\t\t\t\t\t\t\t
  17. The Ultimate Server-Side Caching Guide for WordPress: Redis, Varnish, and Cloudflare Enterprise Explained<\/span><\/li>\n\t\t\t\t\t\t\t\t\t
  18. How to Monitor and Maintain a High-Performance WordPress Server (Without the Guesswork)<\/a><\/li>\n\t\t\t\t\t\t\t<\/ol>\n\t\t<\/div>\n\t<\/div>\n

    Caching is the internet\u2019s short-term memory. Instead of making the server re-cook every single page on every single visit, caching ensures that websites keep ready-to-serve copies<\/strong>\u2014a simple change which, alone, can transform sluggish WordPress installs into sites that feel alive.<\/p>\n

    By definition, caching is the process of storing frequently accessed web data in fast, temporary storage<\/strong> (the cache) ensuring speedy delivery for subsequent requests.<\/p>\n

    At its crux, #caching<\/a> is mostly composed of three collaborating layers: the application layer<\/strong> (page caching + object caching), the server layer<\/strong> (Varnish or Memcached), and edge caching<\/strong> (effected via a CDN such as Cloudflare).<\/p>\n

    As a WordPress site owner, creator, freelance developer, or SMB, dealing with server-side caching can be quite taxing, especially when you lack the tools to effectively tweak your stack for maximum performance<\/strong>. Even so, server-side caching can be one of the most impactful stack points. One that you can leverage in ensuring huge leaps in site performance, better user experience, and meeting the needs of your readers (or customers).<\/p>\n

    In this article, we\u2019ll look into the various ways of turbo-boosting server-side caching on your WordPress\/WooCommerce site<\/strong>. We\u2019ll explain what configs\/approaches have worked for us, and introduce you to a powerful server-caching combination\u2014that will ensure that you can marry all 3 layers of #WordPressCaching<\/a> for the ultimate performance of your site\/business.
    \nBeyond that, we\u2019ll share how, after trying dozens of hosts and stacks, we landed on Cloudways as the ultimate cloud hosting platform<\/strong>, and how it stitches the three caching layers into a single manageable, pre-tuned platform.<\/p>\n

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    \"Abstract
    Visualizing the intricate layers of web caching for optimal performance. The cache can be a crucial piece in optimizing for speed and UX. Source: Pexels.<\/figcaption><\/figure>\n

    2) The 3 WordPress Caching Layers<\/h2>\n

    As shared earlier, WordPress caching is composed of three layers: the application layer, server layer, and the edge cache layer<\/strong>. Whenever a user requests a page from your WP website, their request is routed through these layers as follows:<\/p>\n

    Browser -> Edge (Cloudflare) -> Server (Varnish -> Nginx\/Apache -> PHP-FPM) -> Redis\/Object Caching \/ DB<\/em><\/strong><\/p>\n

    1. The Application Layer<\/h3>\n

    The application layer of WordPress caching is responsible for caching rendered pages at the WordPress level, as well as caching database queries<\/strong> (or PHP objects) using object caching. This is done via a cache plugin, which interfaces with object caching if available, to ensure that cached versions of your site’s pages are delivered\u2014on subsequent requests. Essentially, if and when the same resources are requested again.<\/p>\n

    On Cloudways, our web-host of choice, caching happens at the WordPress level via their powerful Breeze cache plugin<\/strong>. The plugin is responsible for identifying frequent requests (such as home page fetches), producing a cache of that page, and then ensuring it is delivered on subsequent requests\u2014without necessarily hitting the database each time.<\/p>\n

    \"A
    A screenshot of the Breeze WordPress plugin by Cloudways.<\/figcaption><\/figure>\n

    Think of it this way, user A visits a page, loves it so much that they share it with their friends: users B and C. These users also share the page with their friends: users D, and E. The Breeze plugin will recognize the need for the page to be cached\u2014as it is receiving frequent requests\u2014and will go ahead to produce a cache of that page.
    \nAs a result, any subsequent user of that page<\/strong> (Ideally starting with user B in our example) will receive the cached version of the page, saving the web stack the processing that would be required for a data-retrieval trip to the database<\/strong>. Ideally, you should set your page cache plugin to not only cache pages and objects after the first request\u2014but also pre-warm the cache in anticipation of access.<\/p>\n

    Pre-warming the cache is essentially simulating user requests<\/strong>\u2014triggering the creation of caches for those pages; in anticipation of usage.<\/p>\n

    For instance, in the eve of a huge sale on a WooCommerce store, it is advisable to pre-warm the cache, and ensure that when the traffic trickles in, users will experience enhanced page load speeds.<\/p>\n

    Related: How to Optimize WooCommerce for Speed and Security<\/a><\/p>\n

    With the right setup, page caching can be the easiest win\u2014as it serves pre-rendered HTML and keeps PHP and MySQL out of the loop\u2014for most users.<\/p>\n

    Caching at the application level is nuanced, however, as your page cache plugin of choice needs the ability and capability to interface efficiently with your server<\/strong>\u2014to ensure that caching works correctly. This way, caching can also have a huge impact on turbo-boosting user response speeds.<\/p>\n

    Cloudways have thought this through, and introduced a custom page caching plugin, Breeze. The purpose of this plugin is to ensure that caching happens optimally for sites hosted on their platform.<\/p>\n

    \"A
    The application layer of WordPress Caching: where WordPress plugins like Breeze optimize content delivery. Source: Unsplash.<\/figcaption><\/figure>\n

    How?<\/p>\n

    The Breeze plugin is specifically built for their servers.<\/p>\n

    Breeze is powerful, to say the least, and includes a host of features, including page caching, database management, CSS, HTML, and JavaScript minification, and so much more<\/strong>. More importantly, it works optimally with their plethora of cloud servers, and integrates with object caching effectively.<\/p>\n

    You can read more on how to set up the Breeze Caching Plugin<\/a>.<\/p>\n

    Cloudways have gone a step further and provide any and all servers on their platform with Redis Pro Object caching<\/strong>\u2014entirely for free. Not only are you getting strong capable servers, a set-and-forget page caching plugin, you also get to enjoy the benefits of professional object caching with Redis Pro.<\/p>\n

    \"Cloudways
    The Cloudways web stack as configured on the hybrid stack. Regardless of whether you have a small standard server, or a huge CPU-Optimized one, Lightning Stack adds huge leaps in performance. Source: Cloudways.<\/figcaption><\/figure>\n

    By definition, object caching is a server-side technique that stores frequent database objects<\/strong>\u2014such as the results of frequent DB queries\u2014in memory; allowing faster results for subsequent queries<\/strong>.<\/p>\n

    2. The Server Layer of WordPress Caching<\/h3>\n

    The server-layer of WordPress caching is more-or-less the gatekeeper, and sits in front of the web-server, serving full pages from memory<\/strong>. It can be effected via Memcached or Varnish<\/a>\u2014as is the case on Cloudways.<\/p>\n

    On Cloudways servers, Varnish is the gatekeeper; if it knows the page, it answers with cached HTML immediately\u2014with PHP never running for that request.<\/p><\/blockquote>\n

    \"A
    The server layer: Varnish and Lightning Stack working in harmony for rapid content delivery. Source: Unsplash.<\/figcaption><\/figure>\n

    I cannot emphasize enough how powerful that is in terms of performance.<\/strong><\/p>\n

    A normal uncached web request would be handled via PHP<\/strong>. The request would be routed to the DB (let\u2019s call it \u2018PHP pre-processing\u2019), a query result returned, and then PHP undertakes \u2018post-processing\u2019, and routes the result back to the user.<\/p>\n

    This process can take anywhere from a few milliseconds to as long as a minute\u2014depending on the actual speed and power of your server.
    \nWith server-caching, however, and on a kitted-out host like Cloudways, a similar request wouldn\u2019t require any PHP processing at all<\/strong>\u2014requests would be served instantly, from the Varnish cache.<\/p>\n

    Beyond the obvious performance benefits, Cloudways have also introduced Lightning Stack, which can be coupled with premium CPU-Optimized or High-Performance cloud droplets.<\/p>\n

    This combination\u2014CPU-Optimized\/High-Performance servers + Lightning stack (Nginx + Apache + Varnish + PHP-FPM)<\/strong>\u2014further turbo-boosts performance. This is by ensuring that your site not only has the best performance oriented tech, but also the capacity and capability to handle high concurrent usage\u2014and do it reliably.<\/p>\n

    Think of a LearnDash LMS site where thousands of students are taking a test at the same time.<\/p>\n

    Studies indicate that sites using lightning stack can experience faster page loading speeds by as much as 75%<\/strong>. Imagine that.<\/p>\n

    You can read more on how to Maximize ROI via this combination.<\/p>\n

    The beauty of Cloudways, moreover, is that you don\u2019t have to worry about configuring Varnish, or tweaking page caching to accommodate it<\/strong>. All you have to do is install the Breeze cache plugin, and the interface between page caching and server-caching is completely taken care of for you.<\/p>\n

    Do note that you can either use Varnish or Memcached as your server cache<\/strong>, and it is not advisable (or even possible) to use both.<\/p>\n

    3. The Edge Caching Layer<\/h3>\n

    Edge caching is caching done via edge servers, a feature of Content Delivery Networks, CDNs<\/strong>. One such CDN is Cloudflare, where copies of your pages are stored in servers all over the world (edge servers).<\/p>\n

    Whenever a user requests a page or resource from your website, it is delivered from the edge server nearest to them<\/strong>. Needless to say, this can elicit huge gains in page speeds; as the data would only have to travel far less distance, as compared to all requests going to the origin server.<\/p>\n

    Edge caching makes your site load quickly from Singapore to San Francisco\u2014it\u2019s where CDN meets global scale.<\/p>\n

    \"A
    Edge caching: CDNs work by delivering content globally from the nearest server for ultimate speed. Source: Pexels.<\/figcaption><\/figure>\n

    With Cloudways, you get to experience an Enterprise-level CDN at SMB costs\u2014thanks to <\/strong>the Cloudflare Enterprise Add-on<\/a>, which is heavily discounted<\/strong> at less than $10.<\/p>\n

    Mind you, the standard Cloudflare Enterprise plan\u2014when bought directly from the company\u2014will set you back a few thousand dollars every year\u2026 Imagine that.<\/p>\n

    Cloudflare Enterprise caches closer to visitors, and adds latency improvements<\/strong>. It also comes with hugely crucial features such as Polish, Brotli, Argo Smart Routing, a Web Application Firewall (WAF), and Edge Page Caching. We\u2019ll discuss this in detail below.<\/p>\n

    When set up correctly, edge caching adds another powerful layer of caching, on top of page caching\u2014handled by the Breeze by Cloudways plugin.<\/p><\/blockquote>\n

    \n

    3) WordPress Caching Application Layer Deep Dive \u2014 Breeze + Redis\/Object Cache Pro<\/h2>\n

    Now that we understand what the several layers of WordPress caching are, we can now delve deep into each layer\u2014starting with the Application Layer.<\/p>\n

    We\u2019ll use our setup on Cloudways as a point of reference, and share our experience configuring and managing WordPress caching on their tech stack.<\/p>\n

    On Cloudways, the application layer of WP caching comprises the Breeze plugin and Redis Pro, our enterprise-grade object cache<\/strong>. Let\u2019s look into each.<\/p>\n

    Breeze is a WordPress page cache plugin that also handles script minification, has browser cache controls, and an integration to purge the Varnish server cache\u2014on Cloudways<\/strong>. Let me explain.<\/p>\n

    \"Cloudways
    Yes, with Cloudways you not only get really fast, highly-performant servers. You also get a host of powerful add-ons and features to help you gain as much competitive edge as possible. Source: Cloudways.<\/figcaption><\/figure>\n

    We earlier said that the page cache handles caching at the WordPress\/WooCommerce level\u2014ensuring that pages are stored in temporary storage<\/strong> (cache), so that these copies can be the one to be delivered for subsequent requests\u2014without the need for PHP processing and retrieval from the database.<\/p>\n

    The Breeze plugin by Cloudways is, however, much more than just a page cache. It has deep integration with Cloudways\u2019 servers and is specifically built to be compatible with Varnish<\/strong>, the server-level cache we use.<\/p>\n

    Breeze Cache Plugin Features<\/h3>\n

    The plugin also has additional features as follows.<\/p>\n