Audit page speed, Core Web Vitals, image optimisation, caching, CDN configuration, and render-blocking resources.
Website performance directly impacts user experience, conversion rates, and search engine rankings. This audit checklist helps UK businesses systematically evaluate their website's performance across Core Web Vitals, page load speed, image optimisation, caching configuration, CDN setup, and render-blocking resources. Each check includes actionable remediation steps to help you improve performance and achieve better scores in Google's PageSpeed Insights.
Web developers, digital marketing managers, and SEO specialists at UK businesses who need to improve their website's loading speed and Core Web Vitals scores.
Google's thresholds are Largest Contentful Paint under 2.5 seconds, Interaction to Next Paint under 200 milliseconds, and Cumulative Layout Shift under 0.1. Sites hitting "good" across all three typically see better search visibility and lower bounce rates, though most UK SME sites need targeted work on image weight and third-party scripts to get there.
Unoptimised images are usually the biggest culprit, often followed by too many render-blocking scripts, no browser caching, and a shared hosting plan under strain. A proper audit typically finds 3-5 fixable issues that together cut load time significantly without a full rebuild.
Page speed is a confirmed ranking factor, particularly for mobile search, and slow sites also suffer higher bounce rates which indirectly hurts rankings further. Sites improving Core Web Vitals from "poor" to "good" often see measurable gains in both rankings and conversion rate within a few months.
Start with Google PageSpeed Insights for a free baseline score, then work through image optimisation, caching configuration, and CDN setup systematically. This checklist walks through each area with concrete remediation steps so non-technical teams can prioritise fixes before calling in a developer.
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