Site speed affects rankings and conversions at the same time. Google uses Core Web Vitals as a ranking signal, so a slow page can lose search visibility. It also loses money directly: slower load times raise bounce rates and cut checkout completions. Fixing speed improves both search position and revenue per visitor together.
The ranking side runs through Core Web Vitals, three metrics Google measures on real users. Largest Contentful Paint should hit under 2.5 seconds, Interaction to Next Paint under 200 milliseconds, and Cumulative Layout Shift under 0.1. Pass all three at the 75th percentile and you clear the bar; fail, and you compete at a handicap against faster pages targeting the same keyword.
Speed is not the single biggest ranking factor, so don't expect a slow page to jump ten positions from a fast one. It works as a tiebreaker. When two pages have similar content and links, the faster experience wins, and on mobile that gap is wider because Google indexes mobile-first and most users are on slower connections.
The conversion side is where the money shows up fastest. Google and Deloitte data links a 0.1-second load improvement to roughly an 8% lift in retail conversions. Walmart found every 1-second improvement raised conversions by about 2%. Amazon's older internal figure: every 100 milliseconds of latency cost 1% in sales. The direction is consistent across every study.
The mechanism is simple. Each extra second of load time gives a visitor another chance to leave before your page renders. Bounce probability climbs sharply between 1 and 5 seconds. On a checkout or lead form, a janky, slow-responding interface makes people abandon mid-flow, so you pay for the traffic but never capture the sale.
Start by measuring real numbers, not guesses. Run your key pages through PageSpeed Insights and Chrome's CrUX report for field data, and use Lighthouse or WebPageTest for lab diagnostics. Look at LCP, INP, and CLS separately for mobile and desktop. Field data reflects your actual users; lab data tells you what to fix.
For most small business and Shopify sites, the wins are predictable. Compress and lazy-load images, and serve them as WebP or AVIF. Cut third-party scripts, tracking tags, and unused app embeds that block the main thread. Serve assets through a CDN like Cloudflare, enable caching, and defer non-critical JavaScript. On Shopify, audit installed apps first, since each one injects code on every page.
Track speed as an ongoing metric, not a one-time project. Set a budget, LCP under 2.5s on mobile is a fair target, and recheck after every theme change, new app, or marketing tag. Speed decays quietly as you add features, and both your rankings and your conversion rate erode with it before anyone notices.
Frequently asked
Is site speed a Google ranking factor?
Yes. Core Web Vitals (LCP, INP, CLS) are confirmed ranking signals, though they act more as a tiebreaker between similar pages than a dominant factor.
How much can a faster site improve conversions?
Studies show roughly 8% more retail conversions per 0.1-second improvement, and about 2% per full second. Impact varies by site, but faster is consistently better.
What are the target Core Web Vitals scores?
LCP under 2.5 seconds, INP under 200 milliseconds, and CLS under 0.1, measured at the 75th percentile of real users on mobile and desktop.
What's the fastest way to speed up a Shopify store?
Audit and remove unused apps first, compress images to WebP/AVIF, defer non-critical scripts, and enable a CDN with caching. Apps that inject code on every page are usually the biggest drag.
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