Achieving organic growth through faster website performance

A slow, unstable website was holding back visibility, usability and future marketing growth.

Defib Warehouse had outgrown their existing website. The platform had become slow, the user experience was inconsistent, and the backend had grown difficult to work with reliably. Page editing caused issues, the CMS could crash, and the site had accumulated a large number of plugins and a complex page builder setup.

This created a clear commercial problem. Door4’s SEO work was being held back because Google could not reliably load, read and index important pages. Richer content had been created for key brand pages, but the site’s speed and load issues meant those improvements were unable to have their intended impact.

Our objective was to improve website speed, performance and usability so Defib Warehouse had a platform capable of supporting SEO, content, UX and development work. The team also needed to maintain business-critical functionality throughout the rebuild, particularly around ecommerce operations and order management.

Fixing the foundations so SEO, UX and development work could perform properly.

Door4 started with a full technical audit of the website. The first assumption was that the volume of plugins was the main cause of poor performance, so we reviewed every plugin and categorised what was required, what could be removed, and what could be replaced with cleaner code.

As the work developed, we found the problem went deeper. The site’s theme, page builder and stylesheet setup were creating major performance restrictions. That changed the shape of the project. Rather than push ahead with smaller fixes, we recommended a fuller rebuild of the website engine.

This decision came from experience. Door4 had seen before that continuing to invest SEO and optimisation time into a site that cannot technically support it creates a ceiling on performance. For Defib Warehouse, the right route was to create a faster, cleaner and more flexible platform first. That gave future SEO, CRO and UX work a realistic chance of delivering commercial value.

SEO, development and client services worked together to rebuild with confidence and control.

Delivery relied on close collaboration across SEO, development, project management and client services. SEO led the technical audit, keyword targeting and brand-level content planning. Development shaped the rebuild and replaced unreliable or unnecessary plugin-led functionality with cleaner implementation. Project management kept timelines, QA and delivery moving. Client services kept Defib Warehouse informed and aligned throughout.

The rebuild moved the site away from a page builder style setup and into a more standard WordPress theme and stylesheet structure. This meant many blocks, pages and functional areas needed careful replacement to keep the website visually consistent while improving the backend structure.

There were unknowns. Door4 had inherited a platform where many areas were connected in unexpected ways. Some plugins were unfamiliar, and the team used structured testing, trial and error, and constant QA to protect business-critical functionality.

After launch, an issue emerged around WooCommerce order ID mapping. Door4 acted quickly, identified the cause and remapped orders so the client could continue to find and manage orders smoothly.

Success was measured through speed, stability, usability and organic search performance.

The primary success measures were website speed, performance and usability. Door4 tracked Core Web Vitals, site speed and overall load performance before and after the rebuild.

SEO performance was also central. The site needed to give Google a clearer, faster route to crawl and index pages. Once the technical foundations improved, the team tracked organic rankings, share of voice and priority keyword performance.

The most important commercial indicators were the speed gains on high-value pages, the move to good mobile Core Web Vitals URLs, improved keyword rankings, stronger share of voice and position 1 visibility for key terms. Internally, success also meant a faster backend, fewer crashes and a more flexible development environment for future CRO, UX and content work.

Defib Warehouse now has a faster platform built for future optimisation.

The rebuild gave Defib Warehouse a stable and scalable foundation for ongoing growth. The core defibrillator page improved dramatically, with First Contentful Paint falling from 8.3 seconds to 0.8 seconds and Speed Index improving from 11.3 seconds to 1.9 seconds. The overall performance score increased by 37 points, and Core Web Vitals now pass across the board.

That technical progress unlocked meaningful SEO gains. Defib Warehouse now holds position 1 for “defibrillators”, a term with 27,100 monthly searches, alongside strong rankings for any more terms. Across 339 tracked keywords, 171 improved in position.

The next phase is continuous improvement through CRO testing, page redesigns, ongoing speed testing and expanded brand-level content targeting across the top 10 brands.