50+ Site Speed Statistics: Page Load, CWV & Performance (2026)

Last updated: March 2026

A one-second delay in page load time costs 7% in conversions, 53% of mobile users abandon sites that take over 3 seconds to load, and only 33% of websites pass all Core Web Vitals. With average mobile page load times still at 8.6 seconds and page weights exceeding 2.3 MB, site speed remains one of the most impactful — and most neglected — factors in web performance. Here are 100+ site speed statistics covering conversions, Core Web Vitals, page weight, mobile performance, and CMS comparisons for 2026.

Speed & Conversion Impact

Load Time	Bounce Rate Impact	Conversion Impact
0-1 second	Baseline	Optimal conversion
1-2 seconds	+9% bounce rate	-3.5% conversions
2-3 seconds	+32% bounce rate	-7% conversions
3-5 seconds	+90% bounce rate	-15% conversions
5-10 seconds	+123% bounce rate	-25%+ conversions
10+ seconds	+200%+ bounce rate	-40%+ conversions

• Every 1-second delay in page load time results in a 7% reduction in conversions, 11% fewer page views, and 16% decrease in customer satisfaction
• 53% of mobile users abandon a page that takes longer than 3 seconds to load — yet the average mobile page takes 8.6 seconds
• Portent found that pages loading in 1 second have a 39% conversion rate, while pages loading in 5 seconds have only a 22% conversion rate
• Amazon calculated that a 100ms delay costs 1% of sales — for Amazon, that equates to $4.8 billion annually
• Walmart found that for every 1-second improvement in page load time, conversions increased by 2%

Core Web Vitals Statistics

Metric	Good Threshold	% of Sites Passing
LCP (Largest Contentful Paint)	≤ 2.5 seconds	58%
INP (Interaction to Next Paint)	≤ 200 milliseconds	72%
CLS (Cumulative Layout Shift)	≤ 0.1	75%
All three CWV	Pass all thresholds	33%

• Only 33% of websites pass all three Core Web Vitals — LCP is the most common failure point, with only 58% meeting the 2.5s threshold
• INP replaced FID as a Core Web Vital in March 2024, measuring responsiveness more accurately — 72% of sites pass the 200ms threshold
• CLS (layout shift) has the highest pass rate at 75%, improved by widespread adoption of explicit image dimensions and font display swap
• Core Web Vitals are a confirmed Google ranking factor since June 2021 — sites with good CWV see measurable ranking benefits
• The CWV pass rate has improved from 22% (2021) to 33% (2026), driven by better hosting, image optimization, and framework improvements

Page Weight Trends

Year	Median Page Weight (Desktop)	Median Page Weight (Mobile)
2015	1.2 MB	0.9 MB
2018	1.7 MB	1.5 MB
2020	2.0 MB	1.8 MB
2022	2.2 MB	2.0 MB
2024	2.3 MB	2.1 MB
2026	2.3 MB	2.1 MB

• Page weight growth has finally plateaued at ~2.3 MB desktop / 2.1 MB mobile, after years of steady increases
• Images account for 50%+ of total page weight — unoptimized images remain the #1 performance killer
• JavaScript accounts for 22% of page weight (typically 400-500 KB), followed by CSS at 8% (70-100 KB)
• AVIF and WebP adoption has helped slow weight growth — AVIF reduces image size by 50-60% compared to JPEG
• The average page makes 70-80 HTTP requests, down from 100+ in 2020 due to HTTP/2 multiplexing and resource consolidation

Mobile vs. Desktop Performance

Metric	Desktop	Mobile
Average page load	2.5 seconds	8.6 seconds
Median page weight	2.3 MB	2.1 MB
Share of web traffic	~40%	~60%
CWV pass rate	48%	33%
LCP pass rate	72%	58%
Bounce rate (slow pages)	+40%	+123%

• Mobile pages load 3.4x slower than desktop (8.6s vs 2.5s) despite receiving 60%+ of traffic
• The mobile CWV pass rate (33%) is significantly lower than desktop (48%), primarily due to slower LCP on cellular connections
• Mobile-first indexing means Google ranks all sites based on mobile performance — desktop speed alone is insufficient
• The bounce rate penalty for slow mobile pages is 3x higher than desktop, making mobile optimization critical for engagement
• Progressive Web Apps (PWAs) load 2-3x faster than regular mobile web pages due to service worker caching

CMS Performance Comparison

Platform	CWV Pass Rate	Lighthouse Score	Avg. Load Time
Shopify	75-78%	55	1.8s
Wix	71-75%	64	2.2s
Squarespace	55-60%	42	2.8s
WordPress (all)	33-40%	35	3.5s
WordPress (managed)	55-65%	50	2.2s
Joomla	28-32%	30	4.2s
Drupal	40-45%	42	3.0s

• Hosted platforms (Shopify, Wix) consistently outperform self-hosted platforms (WordPress, Joomla) because they control the full stack
• WordPress on managed hosting (WP Engine, Kinsta, Cloudways) achieves 55-65% CWV pass rates — comparable to Squarespace
• The wide variance in WordPress performance reflects hosting quality, theme choice, and plugin count more than the platform itself
• Wix has the highest Lighthouse score (64) of any major platform, reflecting significant infrastructure investments since 2020
• For platform-specific details, see our WordPress statistics and CMS market share reports

Key Takeaways

1. Speed directly impacts revenue. Every 1-second delay costs 7% in conversions, and 53% of mobile users abandon slow sites. For ecommerce, speed optimization is literally money on the table.
2. Most websites fail Core Web Vitals. Only 33% pass all three metrics, with LCP (58%) being the most common failure point. Two-thirds of the web has room for improvement.
3. Mobile is 3.4x slower than desktop. Despite carrying 60%+ of traffic, mobile pages average 8.6 seconds — well above the 3-second abandonment threshold.
4. Images are the #1 performance killer. At 50%+ of page weight, image optimization (AVIF, WebP, lazy loading) delivers the biggest speed gains with the least effort.
5. Hosting matters more than platform. WordPress on managed hosting achieves 55-65% CWV pass rates — comparable to Squarespace and approaching Wix/Shopify levels.
6. Page weight has plateaued at 2.3 MB. Modern image formats and HTTP/2 have slowed the growth trend, but the average page still makes 70-80 requests and loads significant JavaScript.

Sources

• HTTP Archive — Loading Speed Report
• HTTP Archive — Page Weight Report
• HTTP Archive — Chrome UX Report
• Google — Mobile Page Speed Benchmarks
• Akamai — Online Retail Performance Report
• Portent — Site Speed and Revenue Research
• Google — Core Web Vitals Documentation

Frequently Asked Questions

How fast should a website load?

Ideally, a website should load in under 2.5 seconds — that’s Google’s LCP (Largest Contentful Paint) threshold for “good” Core Web Vitals. Pages loading in 1-2 seconds have the best conversion rates. The 3-second mark is the critical abandonment threshold, where 53% of mobile users leave. Currently, the average desktop page loads in 2.5 seconds, but mobile averages 8.6 seconds.

Does site speed affect SEO?

Yes. Core Web Vitals have been a confirmed Google ranking factor since June 2021. Sites that pass all three CWV metrics (LCP, INP, CLS) receive a ranking boost, though content relevance and backlinks remain stronger signals. Beyond ranking, faster sites get lower bounce rates, higher engagement, and better conversion rates — all of which indirectly improve SEO performance. For more, see our web design statistics report.

What percentage of websites pass Core Web Vitals?

Only 33% of websites pass all three Core Web Vitals. Individually, 75% pass CLS, 72% pass INP, and 58% pass LCP. The pass rate has improved from 22% in 2021 to 33% in 2026. Hosted platforms like Shopify (75-78%) and Wix (71-75%) have the highest pass rates, while self-hosted WordPress averages 33-40%.

How much does a 1-second delay cost?

A 1-second delay in page load time costs approximately 7% in conversions, 11% fewer page views, and 16% decrease in customer satisfaction. For Amazon, a 100ms delay equals $4.8 billion in lost annual revenue. For a typical ecommerce store doing $1 million/year, a 1-second improvement could recover $70,000+ in conversions. The impact compounds on mobile, where slow pages see 3x higher bounce rates. For CMS-specific performance data, see our CMS market share analysis.