Most business owners hear “CDN” and think it means one thing: make the website faster.

That’s true, but it’s only part of the story.

A content delivery network now sits at the intersection of website speed, security, uptime, image delivery, bot filtering, API protection, and Core Web Vitals. For web professionals, that makes CDN decisions harder to explain. For business owners, it makes them easier to ignore until something breaks.

The data says ignoring it is a mistake.

According to the 2025 Web Almanac CDN chapter, CDN use is highest among the most popular websites, third-party resources are served through CDNs more often than first-party HTML, and CDNs are one of the main ways newer protocols like HTTP/3 reach real users. On the security side, Cloudflare reported that DDoS attacks more than doubled in 2025.

If you manage a website, sell web services, or need to justify performance work to a non-technical decision maker, these CDN statistics give you the numbers.

CDN Adoption Statistics

  1. 72% of websites use none of the reverse proxy services tracked by W3Techs. That means most sites are still not behind a monitored CDN or reverse proxy service, even though CDN features are widely bundled with modern hosting plans. (W3Techs)

  2. Cloudflare is used by 23.3% of all websites. W3Techs lists Cloudflare as the most widely used monitored reverse proxy service, far ahead of the next providers in its dataset. (W3Techs)

  3. Cloudflare holds 83.5% market share among websites using monitored reverse proxy services. That doesn’t mean Cloudflare owns the entire CDN market, but it does show how dominant it is in the reverse proxy category W3Techs tracks. (W3Techs)

  4. Amazon CloudFront is used by 1.7% of all websites and has 6.0% reverse proxy market share. CloudFront is much more common in cloud-native and AWS-heavy stacks than on the average small business website. (W3Techs)

  5. Fastly is used by 0.9% of all websites and has 3.3% reverse proxy market share. Fastly tends to show up more often on larger publisher, SaaS, commerce, and engineering-led sites than on brochure sites. (W3Techs)

  6. Akamai is used by 0.7% of all websites and has 2.4% reverse proxy market share. Akamai remains a major enterprise CDN provider, even though it is less visible in broad website-count datasets than Cloudflare. (W3Techs)

  7. 35% of mobile HTML content was served through a CDN in 2025. HTML has the lowest CDN usage among the content categories measured by HTTP Archive because many sites still serve the base page directly from origin servers. (HTTP Archive Web Almanac)

  8. 52% of mobile subdomain resources were served through a CDN in 2025. Subdomains often hold assets such as images, scripts, fonts, and style sheets, which are easier to cache than personalized HTML. (HTTP Archive Web Almanac)

  9. 71% of mobile third-party resources were served through a CDN in 2025. Third-party scripts, analytics tags, ad assets, and shared libraries are the most CDN-heavy category in the HTTP Archive dataset. (HTTP Archive Web Almanac)

  10. Third-party CDN usage fell from 75% in 2024 to 71% in 2025. HTTP Archive called this a notable four percentage point decline after years of growth. (HTTP Archive Web Almanac)

  11. HTML CDN usage rose from 33% in 2024 to 35% in 2025. More sites are putting the base document behind CDN infrastructure, helped by hosting platforms that bundle CDN features into standard plans. (HTTP Archive Web Almanac)

  12. The top 1,000 websites had 71% CDN usage in 2025. The most popular websites are the most likely to use a CDN, which makes sense because speed, resilience, and security problems get expensive at scale. (HTTP Archive Web Almanac)

  13. The top 10,000 websites had 70% CDN usage in 2025. CDN adoption stays high just below the very largest websites. (HTTP Archive Web Almanac)

  14. The top 100,000 websites had 62% CDN usage in 2025. Adoption drops as sites get smaller, but it is still a majority among larger web properties. (HTTP Archive Web Almanac)

CDN Provider Statistics

  1. Cloudflare served 58% of CDN-backed mobile HTML requests in the HTTP Archive dataset. For base HTML delivery, Cloudflare was the leading CDN provider by a wide margin. (HTTP Archive Web Almanac)

  2. Google served 21% of CDN-backed mobile HTML requests. Google appears heavily in HTML delivery because many web platforms and Google-hosted services sit behind Google infrastructure. (HTTP Archive Web Almanac)

  3. Amazon CloudFront served 7% of CDN-backed mobile HTML requests. CloudFront’s share is smaller than Cloudflare’s in this dataset, but it remains one of the main general-purpose CDN choices for AWS sites. (HTTP Archive Web Almanac)

  4. Fastly served 5% of CDN-backed mobile HTML requests. Fastly is often chosen when teams need programmable edge behavior, fast cache purging, or traffic control for content-heavy websites. (HTTP Archive Web Almanac)

  5. Cloudflare served 46% of CDN-backed mobile subdomain requests. This is the largest share for subdomain resources in the Web Almanac dataset. (HTTP Archive Web Almanac)

  6. Amazon CloudFront served 28% of CDN-backed mobile subdomain requests. CloudFront is especially common for asset domains, app resources, and AWS-hosted media pipelines. (HTTP Archive Web Almanac)

  7. Google served 53% of CDN-backed mobile third-party requests. Google dominates third-party CDN delivery because so many sites load Google-owned scripts, ads, fonts, analytics, and platform resources. (HTTP Archive Web Almanac)

  8. Cloudflare served 17% of CDN-backed mobile third-party requests. Cloudflare ranked second in the third-party resource category. (HTTP Archive Web Almanac)

  9. Amazon CloudFront served 11% of CDN-backed mobile third-party requests. That put CloudFront third for third-party CDN-backed resources in the Web Almanac dataset. (HTTP Archive Web Almanac)

HTTP/3 and Web Performance Statistics

  1. CDN-served mobile HTML traffic used HTTP/3 29% of the time in 2025. HTTP Archive found that CDNs are much more likely than origin servers to deliver newer protocols to real users. (HTTP Archive Web Almanac)

  2. Origin-served mobile HTML traffic had effectively 0% HTTP/3 usage in the same dataset. That gap shows why many sites get modern protocol support by turning it on at the CDN instead of rebuilding origin infrastructure. (HTTP Archive Web Almanac)

  3. HTTP/1.1 usage for CDN-backed HTML requests fell from 16% in 2024 to 2% in 2025. The shift away from HTTP/1.1 is one of the clearest signs that CDNs are moving the public web toward newer transport layers. (HTTP Archive Web Almanac)

  4. HTTP/1.1 usage for origin requests fell from 56% in 2024 to 21% in 2025. Origin infrastructure improved too, but it still lagged CDN-backed delivery in HTTP/3 adoption. (HTTP Archive Web Almanac)

  5. Cloudflare served 49.9% of mobile document requests over HTTP/3 in 2025. Among major providers listed in the Web Almanac document-request table, Cloudflare had the highest mobile document HTTP/3 rate. (HTTP Archive Web Almanac)

  6. Cloudflare served 69.5% of mobile subresource requests over HTTP/3 in 2025. Subresources tend to show higher HTTP/3 adoption because browsers make repeated requests after protocol negotiation. (HTTP Archive Web Almanac)

  7. Facebook served 99.9% of mobile subresource requests over HTTP/3 in 2025. Purpose-built CDNs can move very quickly when the provider controls both the platform and the delivery path. (HTTP Archive Web Almanac)

  8. Mobile Core Web Vitals pass rates rose from 36% in 2023 to 48% in 2025. The Web Almanac performance chapter attributes this improvement to a mix of browser, device, network, and site optimization changes. (HTTP Archive Web Almanac)

  9. Desktop Core Web Vitals pass rates rose from 48% in 2023 to 56% in 2025. Desktop improved too, but the 2025 increase was smaller than the mobile improvement. (HTTP Archive Web Almanac)

  10. Google’s good Core Web Vitals thresholds are LCP under 2.5 seconds, INP under 200 milliseconds, and CLS under 0.1. A CDN won’t fix every Core Web Vitals problem, but it can help with network, caching, image, and TTFB bottlenecks. (Google Search Central)

  11. Secondary pages had Core Web Vitals pass rates 11 percentage points higher than home pages on mobile. HTTP Archive says secondary pages often benefit from cached resources and more consistent templates. (HTTP Archive Web Almanac)

  12. Secondary pages had Core Web Vitals pass rates 14 percentage points higher than home pages on desktop. This is one reason caching strategy matters beyond the home page. (HTTP Archive Web Almanac)

CDN Security and DDoS Statistics

  1. DDoS attacks surged 121% in 2025. Cloudflare reported that the total number of DDoS attacks more than doubled during the year. (Cloudflare)

  2. Cloudflare mitigated 47.1 million DDoS attacks in 2025. That volume shows why CDN and edge security conversations are no longer only for large enterprises. (Cloudflare)

  3. Cloudflare mitigated an average of 5,376 DDoS attacks every hour in 2025. The hourly average included both network-layer and HTTP DDoS attacks. (Cloudflare)

  4. Network-layer DDoS attacks more than tripled year over year. Cloudflare mitigated 34.4 million network-layer DDoS attacks in 2025, up from 11.4 million in 2024. (Cloudflare)

  5. Network-layer attacks accounted for 78% of all DDoS attacks in Q4 2025. Cloudflare said network-layer attacks fueled the quarter’s growth. (Cloudflare)

  6. Hyper-volumetric DDoS attacks increased 40% quarter over quarter in Q4 2025. Cloudflare also reported that large attack sizes grew by more than 700% compared with late 2024. (Cloudflare)

  7. Cloudflare observed a record 31.4 Tbps DDoS attack in 2025. The attack lasted 35 seconds and was automatically mitigated by Cloudflare’s autonomous DDoS defense systems. (Cloudflare)

CDN Market and Budget Statistics

The CDN market is growing because the job is bigger than static file caching. CDN providers now package performance, image optimization, edge compute, bot controls, WAF rules, API defense, and analytics into the same buying conversation.

Mordor Intelligence estimates the CDN market will reach $26.47 billion in 2025 and grow to $45.13 billion by 2030. Precedence Research estimates a larger 2025 market size of $32.70 billion and projects $38.75 billion in 2026. Fortune Business Insights estimates the market was worth $30.51 billion in 2025 and will reach $36.91 billion in 2026.

Those firms do not agree on the exact dollar figure, which is normal for market research. They do agree on direction: CDN spend is rising.

For a small business website, that doesn’t automatically mean buying the most expensive CDN plan. It means the CDN decision should be tied to risk and revenue:

  • If most visitors are local and the site is small, a bundled CDN from your host may be enough.
  • If you sell nationally, run ads, publish heavy media, or depend on form leads, CDN configuration is worth real attention.
  • If downtime, scraping, bots, checkout speed, or API abuse can cost you money, CDN security features should be part of the budget.

What These CDN Statistics Mean for Business Owners

A CDN is not a magic speed button. HTTP Archive is clear that CDNs can optimize DNS, connection setup, protocol negotiation, caching, compression, routing, and response handling, but results vary based on geography, cache settings, provider implementation, and the website itself. (HTTP Archive Web Almanac)

That last part matters.

If your site ships oversized images, blocks rendering with too much JavaScript, loads ten tracking scripts, and has no clear caching rules, a CDN will help only so much. You need the basics fixed too.

Still, the pattern is hard to ignore. Larger sites use CDNs more often. Third-party platforms rely on them heavily. Newer protocols reach users faster through them. Security attacks are growing. The web is not getting simpler.

For most business owners, the practical question is not, “Do we need a CDN?” It is, “Is our CDN actually configured to protect revenue?”

That means checking whether static assets are cached, whether HTML should be cached or revalidated, whether images are converted to modern formats, whether HTTP/3 is enabled, whether bot protection is blocking junk traffic without blocking customers, and whether DDoS protection is included before you need it.

CDN Checklist for Your Next Website Audit

Use this quick framework when reviewing a client site, redesign, hosting plan, or performance proposal:

  1. Adoption: Is the site behind a CDN or reverse proxy, and is traffic really flowing through it?
  2. Caching: Are images, CSS, JavaScript, fonts, and repeatable pages using sensible cache headers?
  3. Performance: Are TTFB, LCP, image weight, and third-party scripts measured before and after CDN changes?
  4. Protocols: Is HTTP/2 or HTTP/3 enabled at the edge?
  5. Security: Are WAF rules, bot controls, rate limits, and DDoS protection configured for the site’s actual risk?
  6. Operations: Does someone know how to purge cache, bypass cache, review logs, and roll back a bad rule?

The last point is the one teams miss. A CDN that nobody understands can become another black box. A CDN with clear ownership becomes infrastructure you can trust.

FAQ

What is a CDN?

A CDN, or content delivery network, is a geographically distributed set of servers that improves availability, performance, and security by serving website content closer to users. HTTP Archive defines CDNs as intermediary infrastructure that can optimize DNS resolution, connection setup, protocol negotiation, request processing, response handling, and connection management. (HTTP Archive Web Almanac)

Does every small business website need a CDN?

Not every site needs a complex CDN setup, but most business sites benefit from CDN-backed hosting, basic caching, image optimization, and edge security. W3Techs reports that 72% of websites use none of the monitored reverse proxy services, while HTTP Archive shows CDN adoption is much higher among popular sites. (W3Techs, HTTP Archive Web Almanac)

Does a CDN improve SEO?

A CDN can help SEO indirectly by improving speed, reliability, and Core Web Vitals inputs such as TTFB and LCP, but it won’t fix thin content, poor site structure, or bad search intent matching. Google lists LCP, INP, and CLS as Core Web Vitals metrics, with good thresholds of under 2.5 seconds for LCP, under 200 milliseconds for INP, and under 0.1 for CLS. (Google Search Central)

Which CDN is best?

There is no single best CDN for every site. W3Techs shows Cloudflare leading monitored reverse proxy adoption, while HTTP Archive shows different providers leading different categories such as HTML, subdomain assets, and third-party resources. The right choice depends on budget, traffic geography, hosting stack, security needs, and who will manage the configuration. (W3Techs, HTTP Archive Web Almanac)

How do I know if my CDN is working?

Check response headers, DNS records, cache status headers, CDN analytics, WebPageTest waterfalls, Core Web Vitals data, and server logs. You should be able to prove which requests are served from cache, which are passed to origin, and whether performance improved after changes.

If you want a website that loads fast, protects leads, and doesn’t turn into a mystery box every time something changes, we can help. Start here: get a practical website plan.