Updated April 18, 2026

Page Speed Statistics

The relationship between load time and conversions is steeper than most teams realize. Here's the data.

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12%

Conversion Loss per Second

Each second of load time above 2.5s costs approximately 12% of conversions

3.1s

Median LCP (Desktop)

Most pages load too slowly. Only 41% pass Google's 2.5s threshold on desktop.

67%

Mobile Pages Fail CWV

Two-thirds of mobile landing pages fail Google's Core Web Vitals assessment

5.7%

Sub-2s Page Conversion Rate

The fastest pages (under 2s LCP) convert at nearly 2x the rate of 5s+ pages

What does the page speed statistics data show?

Speed is the most underappreciated conversion factor. Every optimization conversation focuses on headlines, CTAs, and design — while the page takes 4 seconds to load and 38% of visitors have already left before seeing any of it.

Published research on landing pages quantifies what most marketers treat as background noise: each additional second of load time above 2.5s reduces conversions by 12%. That's not a marginal effect. A page loading in 5.5s is losing roughly 36% of its potential conversions to speed alone — before a single visitor reads the headline.

The median landing page in published benchmarks loads in 3.1 seconds (Largest Contentful Paint on desktop). On mobile, it's 4.2 seconds. Only 33% of mobile pages pass Google's Core Web Vitals assessment. Most pages are literally too slow to compete, and the teams running them don't realize it because they test on fast office Wi-Fi with Chrome's cache warmed up.

Here's the full speed data — what's normal, what's good, and exactly how much faster pages earn in conversions.

Load time and conversion correlation

The relationship between page speed and conversions isn't linear — it's exponential on the bad end:

  • Under 2s LCP: 5.7% median conversion rate. This is the gold standard, achieved by only 14% of pages in published benchmarks.
  • 2-3s LCP: 5.1% median conversion rate. The sweet spot for most teams — realistic to achieve and nearly as effective as sub-2s.
  • 3-4s LCP: 4.2% median. Still functional, but you're leaving real money on the table.
  • 4-5s LCP: 3.4% median. Below this threshold, visitors are abandoning before they even scroll.
  • Over 5s LCP: 2.8% median. At this speed, optimization of headlines, CTAs, and design is almost pointless — fix speed first.

Core Web Vitals breakdown

Google's three Core Web Vitals metrics for our full dataset:

  • Largest Contentful Paint (LCP): Median 3.1s desktop, 4.2s mobile. Only 41% of desktop pages and 33% of mobile pages pass Google's "good" threshold of 2.5s.
  • Cumulative Layout Shift (CLS): Median 0.14. 52% of pages pass the 0.1 threshold. The most common causes: images without dimensions (38%), late-loading fonts (27%), and injected ad/chat widgets (21%).
  • Interaction to Next Paint (INP): Median 178ms. 61% of pages pass the 200ms threshold. Heavy JavaScript frameworks and unoptimized third-party scripts are the primary offenders.

What's slowing pages down

We audited the technical performance of every page in published benchmarks. The top speed killers:

  • Unoptimized images: The #1 issue on 58% of slow pages. Median image payload is 2.4MB. Pages using WebP/AVIF and proper sizing have 62% smaller payloads and load 1.1s faster on average.
  • Third-party scripts: Median page loads 7.3 scripts from external domains. Each adds an average of 340ms on mobile. Chat widgets (1.2s), analytics bundles (0.6s), and A/B testing tools (0.8s) are the heaviest.
  • Web fonts: 73% of pages load custom fonts. The median font payload is 180KB. Pages using font-display: swap and preloading critical fonts load 0.4s faster.
  • Render-blocking CSS/JS: 44% of pages have render-blocking resources in the critical path. Inlining critical CSS and deferring non-essential scripts saves 0.5-1.2s on average.

The business case for speed

Here's how to translate speed into dollars for your CFO:

Take a page with 10,000 monthly visitors converting at 3.4% (typical for a 4-5s load time). Improving speed to under 3s lifts the expected conversion rate to ~5.1%. That's 170 additional conversions per month. At a $100 average value, that's $17,000/month from a one-time technical investment.

Speed improvements also compound: faster pages rank higher in search (Google uses CWV as a ranking signal), earn lower CPCs in Google Ads (landing page experience affects Quality Score), and reduce bounce rates across all traffic sources. The ROI on page speed is among the highest of any optimization investment you can make.

Methodology

Data based on landing pages analyzed through roast.page. Each page is scored across 8 conversion dimensions using AI vision analysis, content scraping, and Google PageSpeed Insights. Statistics are updated as new pages are analyzed. Citing this data? Use Source: roast.page.

Common questions

How much does page speed affect conversion rate?

Significantly. Published data shows each additional second of load time above 2.5s reduces conversions by approximately 12%. Pages loading under 2 seconds convert at 5.7% median, while pages over 5 seconds convert at 2.8%. That's a 2x difference driven entirely by speed. The relationship is steeper than most teams assume — speed should be your first optimization priority, not an afterthought.

What is a good page load time for a landing page?

Aim for under 2.5 seconds Largest Contentful Paint (LCP). The median in published benchmarks is 3.1s on desktop and 4.2s on mobile. Pages under 2.5s fall in the 'good' range for Google's Core Web Vitals and convert at 5.1% or higher. Under 2s is ideal but only achieved by 14% of pages. If you're above 4s, speed optimization should be your top priority before any design or copy changes.

What slows down landing pages the most?

Three things account for most speed issues: (1) Unoptimized images — the #1 issue on 58% of slow pages, with a median image payload of 2.4MB. (2) Third-party scripts — the median page loads 7.3 external scripts adding 340ms each on mobile. (3) Render-blocking resources — 44% of pages have CSS/JS blocking the critical rendering path. Fixing images alone typically saves 1-2 seconds.

Do Core Web Vitals affect conversion rates?

Yes, both directly and indirectly. Directly, pages passing all three Core Web Vitals (LCP, CLS, INP) convert 31% higher than pages failing all three. Indirectly, CWV affects Google search rankings and Google Ads Quality Score — meaning slow pages pay more for less traffic. Only 33% of mobile pages pass all three CWV thresholds, so there's a significant competitive advantage in getting this right.

Related reading

Page Speed and Conversions — The Data

Full analysis of the page speed to conversion rate relationship.

Page Speed Conversions

How to calculate the revenue impact of speed improvements.

Explore more

Page Speed Analyzer

Test your page speed and get actionable recommendations to improve load time.

Improve Page Speed — Guide

Step-by-step guide to diagnosing and fixing page speed issues.

Mobile Landing Page Statistics

Mobile-specific speed data and the mobile conversion gap.

Resources

2026 Research Report

1,000+ pages scored. Median: 44/100. Full benchmark data by industry and dimension.

Free Tools

Headline analyzer, CTA checker, page speed audit, and more.

Statistics & Benchmarks

Conversion rates, score benchmarks, and data from 5,000+ page analyses.

Learn

Comprehensive guides on landing pages, CRO, copywriting, and design.

Industry Guides

Tailored analysis for SaaS, ecommerce, healthcare, and 50+ industries.

How-To Guides

Step-by-step playbooks for hero sections, CTAs, trust signals, and speed.

Tool Comparisons

See how roast.page compares to HubSpot, Hotjar, PageSpeed, and others.

Glossary

CRO and landing page terms explained — from A/B testing to visual hierarchy.

AI Prompts

Ready-to-use prompts for headlines, CTAs, pricing pages, and copy.

Alternatives

Compare the best landing page analyzers, CRO tools, and website graders.

Blog

Data-driven insights on landing page optimization and conversion rates.

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