Sustainability & Performance Audit

Faster pages. Lower costs. Smaller footprint.

A Cogworks Sustainability & Performance Audit measures your website's speed, page weight, hosting efficiency, and carbon impact across representative pages. You receive a performance playbook with scenario modelling, cost-saving projections, and a prioritised action plan, so you know exactly where to invest for the biggest improvement in speed, cost, and sustainability.

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Sustainability and Peformance | Cogworks Digital Audit

32%

increase in bounce probability when load time rises from 1 to 3 seconds

32%

increase in bounce probability when load time rises from 1 to 3 seconds

32%

increase in bounce probability when load time rises from 1 to 3 seconds

53%

of mobile visitors leave if a page takes over 3 seconds to load

53%

of mobile visitors leave if a page takes over 3 seconds to load

53%

of mobile visitors leave if a page takes over 3 seconds to load

70%

of mobile pages take over 5 seconds to load visual content

70%

of mobile pages take over 5 seconds to load visual content

70%

of mobile pages take over 5 seconds to load visual content

Digital Consultancy Services

Audits & workshops

Digital strategy

Process & Ai Automation

Momentum Framework

Who it's for

This audit is for you if: your website feels slow but you don't know what's causing it. Your hosting costs keep rising without matching improvement. You have sustainability or ESG commitments and need to understand your site's environmental impact. Or you want a clear, quantitative baseline before investing in optimisation.

How it works

Tell us about your site

A short questionnaire to understand your goals, hosting setup, and known performance concerns. Followed by a walkthrough to confirm the key page types to assess and any infrastructure context we need.

We measure, model and benchmark

We run Lighthouse audits and our own in-house carbon calculator across representative page types, break down page weight by asset, review hosting and delivery efficiency, assess third-party script impact, and validate lab findings against real-world Core Web Vitals. Where the data supports it, we model what changes under different optimisation scenarios.

You get the full picture

A playbook walking you through current performance reality, cost and carbon implications, and scenario-based projections. Every finding framed as a business decision with quick wins and structural improvements clearly separated.

Tell us about your site

We measure, model and benchmark

You get the full picture

Tell us about your site

We measure, model and benchmark

You get the full picture

What we look at

Multi-page performance and page weight analysis

Lighthouse audits across representative page types: homepage, content, conversion, capturing Core Web Vitals, scores, and a full asset breakdown. We identify systemic vs page-specific issues and which templates carry the most weight.

Hosting, delivery and infrastructure efficiency

A review of your hosting provider, CDN usage, caching behaviour, compression, and image delivery, answering whether issues are caused by the site or the environment, and what that environment is costing you.

Real-world performance signals

Where field data is available, we compare lab results against actual user experience, segmented by device, to validate findings and flag where lab results may be misleading.

Third-party tool cost and impact review

An inventory of every third-party script, grouped by purpose, measured by load and execution cost, identifying high-cost, low-value tools that undermine performance without delivering proportional business value.

Multi-page performance and page weight analysis

Hosting, delivery and infrastructure efficiency

Real-world performance signals

Where field data is available, we compare lab results against actual user experience, segmented by device, to validate findings and flag where lab results may be misleading.

Third-party tool cost and impact review

What you get

Sustainable Performance & Efficiency Playbook

Current performance reality, hosting costs, asset composition, and sustainability impact, framed as a business case. Includes scenario modelling across three optimisation levels and a "do nothing" projection.

Performance Baseline & Benchmark Scores

Lighthouse scores, Core Web Vitals, and page weight measurements across every tested page. Includes mobile vs desktop comparison and pattern analysis across templates, a repeatable baseline for measuring progress.

Cost & Carbon Impact Model

Scenario-based model estimating hosting cost savings, carbon reduction, and experience improvements across light optimisation, targeted structural work, and inaction. A concrete financial case grounded in your actual numbers.

Prioritised next-steps plan

Every finding mapped to a Now/Next/Later roadmap. Image optimisation and delivery tweaks separated from infrastructure changes. If you want to keep moving, the findings feed directly into a Spark roadmap.

Sustainable Performance & Efficiency Playbook

Performance Baseline & Benchmark Scores

Cost & Carbon Impact Model

Prioritised next-steps plan

Sustainable Performance & Efficiency Playbook

Cost & Carbon Impact Model

Performance Baseline & Benchmark Scores

Prioritised next-steps plan

FAQs about the audit.

Got questions? We’ve got answers. Here’s everything you need to know about our audit

Do we need to commit to optimisation work after a Cogworks performance audit?

Will a Cogworks performance audit tell us what to improve first?

How is a Cogworks performance audit different from running Lighthouse ourselves?

Does a slow or heavy website actually cost more to run?

How long does a website performance and sustainability audit take?

What happens next?

The Sustainability & Performance Audit doesn't end with a report. Every finding connects to a recommended action and we'll walk you through what it would take to address each one. If you want to keep moving, the findings feed directly into a Spark roadmap so the work you've done here becomes the foundation for everything that comes next.

Get your audit

View all audits

Let’s talk.

If you’re looking for a digital consultancy in the UK that combines strategic clarity with proven delivery, get in touch and we’ll take it from there.

Client Strategist

@ Cogworks

Katie Grant Watson

Let’s talk.

If you’re looking for a digital consultancy in the UK that combines strategic clarity with proven delivery, get in touch and we’ll take it from there.

Client Strategist

@ Cogworks

Katie Grant Watson

Let’s talk.

If you’re looking for a digital consultancy in the UK that combines strategic clarity with proven delivery, get in touch and we’ll take it from there.

Client Strategist

@ Cogworks

Katie Grant Watson