What Google Measures
Google's Core Web Vitals measure three speed dimensions: Largest Contentful Paint (LCP, how fast the main content loads), Interaction to Next Paint (INP, how responsive the page is to interaction), and Cumulative Layout Shift (CLS, how stable the layout is as it loads).
Google collects real-world data from Chrome users through the CrUX dataset. This means your score reflects how real users experience your site, not just how it performs in a lab. A site that passes lab tests but has slow real-world LCP is still penalised.
The Biggest Speed Gains
In my experience auditing Dubai business sites, the biggest speed gains come from: image optimisation (converting to WebP, lazy loading below the fold, correct sizing), eliminating render-blocking scripts (moving JavaScript to async/defer or end of body), and reducing server response time (TTFB) through caching and hosting upgrades.
For WordPress sites, caching plugins and a CDN like Cloudflare can often halve load times with minimal development work. For React and Next.js sites, server-side rendering and proper code splitting are the key levers.
Speed and Conversion Rate
The business case for speed is not just rankings. A 1-second improvement in load time improves conversion rate by 7% on average. For a Dubai e-commerce site processing AED 100,000 per month in organic revenue, that is AED 7,000 per month from a one-second improvement alone.
I always tie speed improvements to business outcomes, not just Lighthouse scores. A score improvement that does not move real-world metrics has not delivered value.