Powered by 100% renewable energy
Data centre located close to target users

Our site is hosted by Digital Ocean using an Equinix facility in London (Equinix LD5) which is powered by 100% renewable energy (see Equinix Sustainability Guide PDF).

We chose a London data centre to be closer to our target users, the largest share of which are in the UK (40.16% share in August 2021) .

Content delivery

All static content delivered by a CDN

We use a Content Delivery Network (CDN) to deliver all our static assets to users. This means the largest files on the site are delivered from locations nearest to users around the world. This reduces the distance data needs to travel, reducing energy use and page load times significantly.

Server caching

Static HTML pages served to most users
HTML, CSS, JS files gzipped and minified

We use multiple caching techniques to deliver the site in the fastest and most energy efficient way possible.

All pages are served by a CMS caching module, enabling static versions of dynamic pages to be served to most users. In tests this loads > 98% faster compared to non-cached pages.

All HTML, CSS and JS are gzipped, minified and cached. Unnecessary data such as comments, whitespace, and optional tags are stripped from these files.

Progressive Web App technology (PWA)

Files are stored locally to reduce network requests
Site loads only new content between pages

The site uses PWA techniques to further increase site performance and reduce data transfer.

We use a service worker to cache files on users devices using local storage, meaning that we can massively reduce the number of network requests per session.

Page loads are also reduced by only loading the required content for each new page. Common elements (eg. the footer) are not requested for each new page the user visits.


Highly optimised using CDN image processing
Use of modern formats (webp, svg)


Reduced number of font variations
Use of modern formats (WOFF, WOFF2)


Highly optimised for SEO
Helping users find the most relevant content quickly


Clear and efficient copy designed to avoid unecessary time reading


Clear and simplified UX to help users get to content with fewer clicks

Latest PHP version

Latest version of PHP to ensure the most efficient use of server resources

Work still to do

Create 'dark mode' version of the site to reduce energy use on end user devices
Explore ways to reduce use of Javascript, lowering the processing power needed
Assess use of video across the site, incl. if autoplay required and shortening length


This checklist is based on 17 ways to make your website more energy efficient by Wholegrain Digital.

Last updated 15/12/2021