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    OpenCart Varnish Cache

    OpenCart Varnish Cache: The extension allows the admin to integrate the Varnish Caching features within the websites. The admin sets varnish configurations for fields such as Host Name, Port Number, Access IP List, First Byte Timeout, Between Byte Timeout, Connection Timeout, Backend Polling, etc. The user can even check the connectivity of their website with the varnish cache by inspecting the respective website page(s).

    Implement PhpFastcache Cache on your Opencart website by using Opencart Cache System module.

    Official OpenCart Gold Partner and Core Code Contributor
    Working for OpenCart since 2010 and contributed to latest stable release v3.0.3.7

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    OpenCart Varnish Cache: Performance optimization for any online website is extremely essential as customers prefer navigating sites that are fast performing and do not make them wait. Therefore, adding a varnish cache between the Client and the Backend (Server) is a good idea as it caches the requests and sends it to the backend. In turn, the backend forwards the responses to the varnish which caches and delivers it to the associated client.

    OpenCart Varnish Cache Module integrates the varnish cache feature that ensures faster page load times, enhances the user experience and improvises the SEO factor of the website. In addition to this, a time-to-live is set which helps save the bandwidth consumption.

    Highlighted Features

     Varnish Cache, for Faster Performing Websites

    The store owners can incorporate the Varnish Cache feature which caches the responses which the backend delivers to the client.

     Backend Polling

    Where Varnish does not receive the requests, backend polling, if enabled, initiates forwarding requests to the backend.


    The time-to-live feature ensures that a website consumes a lesser bandwidth over a network.

     Websites’ Optimized Performance

    Faster page load times with the caching process assures a faster performing website.

    Why do we need the OpenCart Varnish Cache Module?

    For giant online websites, faster loading pages is a must. Of course, such websites have to entertain thousands of customers each day.

    Just imagine, if while navigating through some world-renowned website, customers had to sit impatiently, waiting for the buffer sign to disappear, it would be a complete a turn down for the website.

    Thus, to improve the performance of a website, one can integrate the OpenCart Varnish Cache Module feature for sure as it's caching scenarios can turn out to be a boon for heavy websites, and even for websites that deal with large customers on a daily basis.

    The reason being, it caches the requests and thereby responses, resulting in faster page load times.

    Apart from this, the website's resources can be stored in a compressed form in the varnish, which ensures a lesser bandwidth consumption. Through integrating the Varnish Caching feature can enhance the performance of the website, which in turn shall lure more customers to the store and converting visitors of a store to permanent customers.

    OpenCart Varnish Cache

    Configuring Varnish FPC Module

    The store owners will have to set the following configurations in order to activate the varnish cache feature within their websites.

    • Once enabled, the admin needs to set the IP address of the host/ client and backend port number.
    • A list of IP’s is defined by the admin under the access list.
    • The first byte, between byte and connection timeout durations (in secs), is set by the admin.
    • The admin sets a grace period or the time duration for which the client can hold the website resources.
    • Time-to-live duration is set in seconds, which helps reduce the bandwidth consumption of the website.
    • Bypass URL includes URL of the website's pages which do not require caching.
    • The admin can enable the backend polling and accept-encoding fields.
    Configuring Varnish FPC Module

    Beneficiary Aspects of Integrating the Varnish Cache

    Cache through Varnish can turn out to be a boon for heavy websites, Some of the benefits it inlays are as follows:-

    • It is useful for websites that deal with large customers on a daily basis.
    • A website’s resources can be stored in the varnish cache in compressed form.
    • Improvises a website’s performance by optimizing its speed.
    • A website would consume a comparatively lesser bandwidth.
    • VCL or Varnish Configuration Language helps identify duplicate requests, resulting in precise caching.
    Beneficiary Aspects of Integrating the Varnish FPC

    Core Web Vitals - Google Ranking Factor 2021

    With Google announcing upcoming algorithm update on ranking factor, measurement, and page experience. The site owners are now guided with three key metrics (LCP, FID, CLS) that are essential for delivering a great user experience.

    • Largest Contentful Paint (Loading) - It measures the time taken to show the main content element (such as a large image or text) to the user. This is useful to check page rendering time and loading performance.
    • First Input Delay (Interactivity) - It checks how quickly a page responds to user interaction (such as clicking a link or tapping a button).
    • Cumulative Layout Shift (Visual Stability) - It scores unexpected page layout shifts (such as - movement of text, link, button) during the loading phase.

    Opencart  SEO Extension and Opencart Cache System offer various important features (WebP Image Optimization, Improve Lighthouse Page Performance, Minify & Combine CSS, JS, HTML files, CDN Loading, Leverage Cache). Helping to optimize your web store content and support upcoming 2021 Google Algorithm UX changes with Core Web Vitals.

    Core Web Vitals - Google Ranking Factor 2021


    • The admin needs to set the Host IP and also the Port Number of the server.
    • An Access List, which includes a list of IP's. It takes in the IP of the default host when not chosen by the admin.
    • The admin has to configure the First Byte and Between Byte timeouts (in seconds).
    • A Connection Timeout is set within which the server must send the response to the varnish.
    • A cache time to live is set by the admin which stores the copy of your website's resources.
    • The admin may even enable the Backend Polling where the client requests are sent to the server if the varnish cannot respond to the request.
    • Varnish help reduces network bandwidth consumption as well as instigate faster page load times.


    For any query or issue, please create a support ticket here

    You may also check our quality Opencart Extensions.


    Product Version2.0.0.1
    Released4 years ago
    Last UpdatedOctober 10, 2023 (8 months ago)
    Supported VersionsOpenCart  2.x.x.x  3.x.x.x  
    Rating 5.0
    based on 1 reviews

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    Frequently Asked Questions

     Which module offers a caching feature for optimizing the websites’ speed?
    OpenCart Varnish Cache Module facilitates the store owners to integrate the varnish caching feature which helps improve the website's performance.
     What is the functionality of time-to-live?
    Time-to-live ensures a reduction in a website’s bandwidth consumption over a network.
     How does Backend Polling help in the caching procedure?
    Whenever a varnish is unable to process a request and cache it, backend polling, if enabled by the admin, would add-on to forward the request to the server.
     What is an additional befitting factor of the OpenCart Varnish Cache Module?
    Where the OpenCart Varnish Cache Module helps in a faster website load time, it even adds-on to affect the SEO of the website, positively.
     For what kind of websites can one use a varnish cache?
    The Varnish Caching feature can be used for websites that encounter heavy traffic on a daily basis.

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    In our default configuration we will provide tremendous configuration for your eCommerce Website which is fast to load and response.

    Default Configuration Details of Server

    • 1 GB RAM
    • 1 Core Processor
    • 30 GB Hard Disk
    • DB with 1 GB RAM and 1 Core Processor

    * Server Configuration may vary as per application requirements.

    Want to know more how exactly we are going to power up your eCommerce Website with Cloud to fasten up your store. Please visit the Cloudkul Services.

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    • + Features
    • - Bugs
    • * Fixed all the git issues
    • + Added the module for the for Opencart Version 2.3.x.x and 3.x.x.x