Hvad er Page Speed?
Hurtig definition
Sidehastighed er et mål for, hvor hurtigt en webside indlæses og bliver interaktiv, og påvirker direkte brugeroplevelsen og rangeringer i søgemaskiner.
Page speed is a catch-all term for how fast a web page loads. It's measured in multiple ways: Time to First Byte (TTFB) measures server response time, First Contentful Paint (FCP) measures when the first content appears, Largest Contentful Paint (LCP) measures when the main content is visible, and Time to Interactive (TTI) measures when the page is fully usable.
Page speed is influenced by many factors: server response time, file sizes (images, CSS, JavaScript), number of HTTP requests, render-blocking resources, third-party scripts, and the user's network connection and device capabilities.
Google's PageSpeed Insights tool and Lighthouse audit provide detailed performance scores and actionable recommendations. These tools measure both lab data (simulated conditions) and field data (real user measurements from Chrome UX Report).
Optimizing page speed typically involves compressing and properly sizing images, minifying CSS and JavaScript, implementing lazy loading, leveraging browser caching, using a CDN, reducing third-party script impact, and optimizing the critical rendering path (the sequence of steps the browser takes to render the page).
Hvorfor det er vigtigt
Page speed directly impacts revenue. Amazon found that every 100ms of latency cost them 1% in sales. Google uses page speed as a ranking factor, and users abandon sites that take more than 3 seconds to load. A 1-second improvement in page speed can increase conversions by 7%.
Mobile users are especially sensitive to speed — they're often on slower connections and less powerful devices. With mobile traffic exceeding desktop for most websites, mobile page speed is critical.
Eksempler fra den virkelige verden
A retail website reduced their page load time from 5.7 seconds to 1.8 seconds and saw a 23% increase in conversion rate and 15% decrease in bounce rate
A news site optimized their images from average 2MB to 150KB each and improved their PageSpeed Insights score from 35 to 85
A B2B company removed 8 third-party tracking scripts that were adding 3 seconds to page load time, with no measurable impact on their analytics accuracy
A travel booking site implemented lazy loading for below-the-fold content and improved their Core Web Vitals, gaining a measurable ranking boost in Google
Relaterede termer
Core Web Vitals
Core Web Vitals er tre specifikke målinger defineret af Google, der måler den faktiske brugeroplevelse på websteder: indlæsningsydeevne (LCP), interaktivitet (INP) og visuel stabilitet (CLS).
LCP (Largest Contentful Paint)
LCP måler den tid, det tager for det største synlige indholdselement på en side, såsom et hero-billede eller en overskrift, at blive fuldstændigt gengivet.
TTFB (Time to First Byte)
TTFB måler tiden fra en browser anmoder om en side, til den modtager den første databyte fra serveren, og fungerer som en indikator for serverrespons.
Lazy Loading
Lazy loading er en teknik, der udskyder indlæsningen af ikke-kritiske ressourcer, såsom billeder under folden, til de faktisk er nødvendige.
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