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Website performance optimisation

A slow website costs visitors, conversions and rankings. We audit what is holding you back, then fix load times, Core Web Vitals and the technical issues that make pages feel sluggish.

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  • Core Web Vitals
  • Page speed
  • Technical audits
  • Real outcomes

What's in a performance engagement

  • Technical performance audit

    We measure how the site behaves for real users and in the lab, then translate findings into a clear fix list.

    • Core Web Vitals baselines
    • Bottlenecks in assets, scripts and rendering
    • Prioritised recommendations you can act on

  • Speed optimisation

    We reduce load times and improve how quickly pages become usable, without gutting the experience your brand needs.

    • Image, font and asset strategy
    • JavaScript and CSS delivery
    • Caching and hosting improvements where they matter

  • Ongoing performance checks

    Speed regresses when sites change. We can re-check after launches or as part of ongoing care so gains stick.

    • Before and after comparisons
    • Regression checks after releases
    • Guidance for your team on what not to break

Audit to faster pages

  1. 01

    Measure

    Field and lab data, key templates, and the journeys that matter to revenue.

  2. 02

    Diagnose

    We isolate the bottlenecks worth fixing and skip noise that will not move the needle.

  3. 03

    Fix

    Implement the highest-impact changes, or pair with your team if you want to keep ownership in-house.

  4. 04

    Verify

    Re-test Core Web Vitals and page feel, then document what changed.

Frequently asked questions

Straight answers to the questions we hear most. If yours is not here, ask us on a call.

What is included in a performance audit?

We look at real-user Core Web Vitals for each key template, split by mobile and desktop, then trace the bottlenecks behind them. You get an ordered fix list tied to the pages that earn money, not a generic score report.

How fast does my website need to be?

Google's thresholds for a good experience are LCP under 2.5 seconds, INP under 200 milliseconds and CLS under 0.1, measured at the 75th percentile of real visits. That is the floor. On revenue-critical pages it is often worth setting tighter targets.

Source: web.dev: Defining the Core Web Vitals thresholds (opens in new tab)

My Lighthouse score is over 90. Is my site fast enough?

Not necessarily. Lighthouse is a lab test on a simulated device, while Core Web Vitals come from real visitors. A 2021 HTTP Archive analysis found that 43% of mobile pages scoring 90 or more in Lighthouse still failed at least one Core Web Vitals threshold in the field. That was before INP replaced FID and we have not seen a newer comparison, so judge your site on its real-user data in Search Console or PageSpeed Insights.

Source: HTTP Archive: Lighthouse scores as predictors of CrUX data (opens in new tab)

What usually slows a website down?

On most sites it is too many third-party scripts, unoptimised hero images, render-blocking JavaScript, slow server response and layout shift from late-loading content. The first two cause most of the damage on marketing sites and ecommerce templates.

Does site speed affect conversions and SEO?

Yes. Vodafone's A/B test found a 31% LCP improvement lifted sales by 8%. Google also uses Core Web Vitals in its ranking systems, alongside many other signals, so good scores help but will not outrank more relevant content. The bigger effect is on how people behave once they land, and the same fixes help both.

Sources: web.dev: Vodafone case study (opens in new tab), Google Search Central: Page experience (opens in new tab)

How soon will we see results?

Real-user monitoring shows changes within days. Search Console and PageSpeed Insights use a 28-day rolling window, so improvements appear there over a few weeks. Conversion gains usually show up quickly on the templates you fixed.

Sources: Search Console Help: Core Web Vitals report (opens in new tab), About PageSpeed Insights (opens in new tab)

Do you only work on sites you built?

No. We audit and improve existing sites, including Shopify stores. If a smaller change beats a rebuild, we will say so. If the architecture is the real problem, we will say that too.

Let's build something better

If your current website or software isn't delivering, we think it's time to talk. We'll review what you have, identify what's not working and show you how to improve it.

Book a call with us (opens in new tab)