Page Speed
How quickly a web page loads and becomes interactive for users.
The Definition
Page speed encompasses multiple metrics including Time to First Byte (TTFB), First Contentful Paint (FCP), Largest Contentful Paint (LCP), and Time to Interactive (TTI). It is influenced by server response time, resource optimization, caching strategies, code efficiency, and content delivery network (CDN) usage.
Why It Matters
Page speed is a direct Google ranking factor and a core component of user experience. 53% of mobile users abandon sites that take longer than 3 seconds to load. Faster pages also get crawled more frequently by search engines, improving indexation speed.
Best Practices
Use a CDN to serve static assets from locations geographically close to your users
Enable Brotli or Gzip compression for all text-based resources (HTML, CSS, JS, SVG)
Implement effective browser caching with appropriate Cache-Control headers for static assets
Preload critical resources (fonts, above-the-fold images, key CSS) with <link rel="preload">
Minimize main thread work by reducing JavaScript execution time and splitting long tasks
Use resource hints (preconnect, dns-prefetch) for critical third-party origins
Mistakes to Avoid
- 1
Loading all JavaScript synchronously in the head instead of deferring non-critical scripts
- 2
Serving uncompressed resources, increasing transfer sizes by 60-80% unnecessarily
- 3
Not leveraging browser caching, forcing repeated downloads of unchanged static assets
- 4
Running too many synchronous third-party scripts that block the main thread and delay interactivity
Audit Checks
How Digispot AI identifies and fixes related issues
Page load time is excessively high (> 4s).
Impact: Slow loading impacts user retention, SEO rankings, and conversions.
Optimize assets, use lazy loading, and implement server-side optimizations.
Speed Index is poor (> 4s).
Impact: Poor Speed Index affects perceived loading time and user satisfaction.
Optimize above-the-fold content and reduce render-blocking resources.
Server response time is high (TTFB > 200ms).
Impact: Slow server response delays rendering and impacts user experience.
Optimize server configurations, use CDN, and cache responses.
Largest Contentful Paint (LCP) is slow (LCP > 2.5s).
Impact: Poor LCP negatively impacts user experience and SEO performance.
Optimize large above-the-fold images, fonts, and critical rendering paths.
Cumulative Layout Shift (CLS) is high (CLS > 0.1).
Impact: High CLS causes visual instability, impacting user trust and usability.
Include size attributes for images and videos, avoid dynamically injected content.
Total Blocking Time (TBT) is excessive (> 300ms).
Impact: High TBT delays user interactions and degrades UX.
Optimize JavaScript execution, reduce main thread work, and use web workers.