Page Speed and SEO: Why Your Slow Website Is Costing You Rankings

Why Page Speed Matters

A 1-second delay in page load time leads to a 7% reduction in conversions. 53% of mobile users abandon a site that takes more than 3 seconds to load. These aren't edge cases. They're the norm. Slow sites lose customers before those customers even know what you're selling.

Page Speed as a Ranking Factor

Google has explicitly included page speed in its ranking algorithm since 2010 for desktop, and 2018 for mobile. In 2021, Google introduced Core Web Vitals — a set of specific speed and user experience metrics that directly influence rankings. If your Core Web Vitals scores are poor, you will rank lower than a competitor with similar content but a faster site.

What Are Core Web Vitals?

Largest Contentful Paint (LCP): how long it takes for the largest visible element on the page to load. Should be under 2.5 seconds. First Input Delay (FID) / Interaction to Next Paint (INP): how quickly the page responds to user interaction. Should be under 200ms. Cumulative Layout Shift (CLS): how much the page layout shifts as it loads (those infuriating moments when you try to click something and it jumps away). Should be under 0.1.

How to Check Your Page Speed

Go to PageSpeed Insights (pagespeed.web.dev)

Enter your URL

Check both mobile and desktop scores

Focus on mobile — it's usually worse and matters more

The Most Common Causes of Slow Pages

Uncompressed images This is responsible for the majority of slow page issues. Images that are 2MB+ when they could be 200KB. Fix: compress every image with TinyPNG or Squoosh before uploading. Use WebP format where possible. Too many apps or plugins Every app, plugin, or widget you add to your site loads extra code. Some are essential. Many aren't. Fix: audit your installed apps. Remove anything you don't actively use. Slow hosting Cheap shared hosting puts your site on a server with hundreds of other sites competing for the same resources. Fix: upgrade to faster hosting, or use a CDN (Content Delivery Network) to serve your files from locations closer to your visitors. Render-blocking resources Scripts and stylesheets that load before your page content, forcing visitors to wait. Fix: this usually requires developer help or a caching plugin, but most modern website platforms handle this automatically. No caching Without caching, your site has to rebuild every page from scratch for every visitor. Fix: install a caching plugin (WordPress) or use a platform with built-in caching (Shopify, Squarespace).

Platform-Specific Tips

Shopify: Choose a lightweight theme. Audit your apps — uninstall anything unused. Compress all product images. WordPress: Install a caching plugin (WP Rocket or W3 Total Cache). Use a CDN. Minimise plugins. Wix/Squarespace: These platforms handle most performance optimisation. Focus on image compression.

FAQ

What score should I aim for? Above 70 on mobile is good. Above 90 is excellent. Don't obsess over the number — focus on the specific issues flagged in the report. Does page speed affect mobile rankings more? Google now uses mobile-first indexing, which means it primarily uses the mobile version of your site for ranking. Yes, mobile speed matters more. Can I improve speed without a developer? Yes, for most common issues. Image compression, removing unused apps, and choosing a faster theme don't require coding knowledge.