Vad är Page Speed?
Snabbdefinition
Sidhastighet är ett mått på hur snabbt en webbsida laddar och blir interaktiv, vilket direkt påverkar användarupplevelsen och sökmotorrankningar.
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).
Varför det spelar roll
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.
Verkliga exempel
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
Relaterade termer
Core Web Vitals
Core Web Vitals är tre specifika mätvärden från Google som mäter verkliga användarupplevelser på webbplatser: laddningsprestanda (LCP), interaktivitet (INP) och visuell stabilitet (CLS).
LCP (Largest Contentful Paint)
LCP mäter den tid det tar för det största synliga innehållselementet på en sida, som en hero-bild eller rubrik, att renderas fullständigt.
TTFB (Time to First Byte)
TTFB mäter tiden från det att en webbläsare begär en sida tills den tar emot den första datasytan från servern, som ett mått på serverns svarstid.
Lazy Loading
Lazy loading är en teknik som skjuter upp laddningen av icke-kritiska resurser, som bilder under fold, tills de faktiskt behövs.
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