In the September 2026 crawl, HTTP Archive saw PageSpeed answering on 39,564 origins. 20,625 of them report a version; 18,939 send the header with the version hidden. PageSpeed-serving origins are 0.245% of the root pages in the crawl, down from 0.935% in December 2020, the first crawl in this census.
What this census is
The census counts origins. One origin is the root page of a site: scheme, host and /. Every number comes from the monthly HTTP Archive crawl, which loads the root pages of the sites in Chrome’s popularity data and records what each server sends back. An origin counts as PageSpeed-serving when HTTP Archive’s technology detection finds PageSpeed on its root page. The version is the value of the response header the module sends. The headline and the series combine the desktop and mobile crawls per origin; the server, detection and network tables use the desktop crawl only.
The dataset publishes aggregates only. It names no origin, no hostname and no IP address, and neither does this post. The queries, the tables and the method are in the pagespeed-census repository, with the details in its methodology. We maintain the current mod_pagespeed line, so we have an interest in these numbers. That is why everything is public: you can rerun it and check our reading.
Adoption since December 2020
Crawl
Google-era
Incubator-era
Current line
Version hidden
Total
December 2020
61,334
131
0
11,939
73,404
January 2021
60,935
156
0
11,994
73,085
January 2022
53,520
546
0
13,340
67,406
January 2023
62,085
2,174
0
38,027
102,286
January 2024
43,751
3,028
0
28,924
75,703
January 2025
31,396
5,016
0
23,157
59,569
January 2026
23,341
4,939
0
21,145
49,425
September 2026
16,421
4,182
22
18,939
39,564
Unreleased trunk builds that report 1.15.0.0-<revision> are counted as incubator-era. The current line appears from the June 2026 crawl on.
The count moves with the crawl as well as with the web.
HTTP Archive’s crawl grew from 8,388,540 root pages in June 2022 to 15,586,166 in August 2022; the jump in the chart that year follows it.
Counts across crawls are not directly comparable because the crawl grew, so the share of root pages is the trend to read. The split between versioned and hidden origins also shifts between some crawls, so read the buckets as trends. Since early 2023 the count has fallen in most crawls.
Google-era builds are still the largest group of origins that report a version, and they account for most of the decline. Incubator-era builds grew until late 2025 and have eased since. A large cohort sends the header with the version hidden. In earlier crawls some origins report 1.15.0.0-<revision>, the version string of the unreleased incubator trunk. No 1.15 release existed until June 2026. The census counts those builds as incubator-era. The current line is still a small group.
Who runs it today
Reported version
Era
Origins
(hidden)
Version hidden
18,939
1.13.35.2
Google-era
12,725
1.14.36.1
Incubator-era
4,182
1.4.26.5
Google-era
2,073
1.11.33.4
Google-era
1,011
1.9.32.14
Google-era
343
1.11.33.2
Google-era
71
1.12.34.2
Google-era
42
1.9.32.3
Google-era
37
1.11.33.5
Google-era
24
1.15.0
Current line
21
1.8.31.4
Google-era
14
Two builds dominate: 1.13.35.2, the last Google-era release, and 1.14.36.1, the incubator release. Below them sits a long tail of older Google-era versions.
The module’s header name tells the engines apart. X-Mod-Pagespeed comes from the Apache module and X-Page-Speed from the nginx module. The Server header names the front-most server, which is often not the one running the module.
On the desktop crawl, 21,662 origins send X-Mod-Pagespeed, the Apache module’s header, and 13,849 send X-Page-Speed, the nginx module’s header. The Apache module answers behind an nginx front on 6,549 origins and behind Cloudflare on 2,774.
So a Server header of nginx or Cloudflare does not mean the nginx module. Read the Server family in the table below as context, not as the engine.
Module header
Server header family
Origins
Apache module (X-Mod-Pagespeed)
Apache
11,061
Apache module (X-Mod-Pagespeed)
nginx
6,549
Apache module (X-Mod-Pagespeed)
Cloudflare
2,774
Apache module (X-Mod-Pagespeed)
Other
662
Apache module (X-Mod-Pagespeed)
Not sent
608
Apache module (X-Mod-Pagespeed)
LiteSpeed
7
Apache module (X-Mod-Pagespeed)
IIS
1
nginx module (X-Page-Speed)
nginx
11,156
nginx module (X-Page-Speed)
Cloudflare
2,363
nginx module (X-Page-Speed)
Other
232
nginx module (X-Page-Speed)
Not sent
79
nginx module (X-Page-Speed)
IIS
18
nginx module (X-Page-Speed)
LiteSpeed
1
Where it runs
Rank band
PageSpeed origins
All origins
Share
top 1k
0
772
0.00%
1k–5k
9
3,060
0.29%
5k–10k
5
3,814
0.13%
10k–50k
54
30,373
0.18%
50k–100k
86
38,526
0.22%
100k–500k
888
318,986
0.28%
500k–1M
1,146
412,641
0.28%
1M–5M
9,939
3,472,144
0.29%
5M–10M
11,537
4,504,092
0.26%
10M–50M
15,900
7,366,216
0.22%
Detection finds no PageSpeed origin in the top 1k. Below that the share is small and roughly flat: a few origins in every thousand, in every band. The bands come from HTTP Archive’s rank buckets, which start with the March 2021 crawl; each origin falls in exactly one band. The latest crawl has no unranked origins, so the table leaves that row out.
Segment
WordPress share
PageSpeed-serving origins
49.5%
All origins
31.3%
About half of the PageSpeed-serving origins also run WordPress, a clearly higher share than across all origins. We also tried to measure cPanel, a common shared-hosting control panel. Technology detection finds no cPanel install among the PageSpeed origins, against a small number across the whole crawl, so cPanel cannot be measured this way. That is a limit of the detection, not a finding about hosting.
The ten largest networks
Network
Share of header-bearing desktop pages
CLOUDFLARENET - Cloudflare, Inc., US
14.5%
XSERVER - Xserver Inc., JP
9.4%
Ukraine-AS - Hosting Ukraine LTD, UA
9.2%
HETZNER-AS - Hetzner Online GmbH, DE
7.8%
NETARTGROUP - Nazwa.pl Sp.z.o.o., PL
6.1%
GMO-I-R1 - GMO Internet, Inc., JP
6.0%
AMAZON-02 - Amazon.com, Inc., US
5.0%
GMO-I-R2 - GMO Internet, Inc., JP
3.7%
AMAZON-AES - Amazon.com, Inc., US
2.9%
IDCF - IDC Frontier Inc., JP
2.6%
The shares are of header-bearing desktop root pages with an IP address the routing data could attribute, which is nearly all of them. The address is the front-most one the crawler connected to, so a site behind a CDN counts toward the CDN. That is why the largest entry is a CDN: the table shows where sites are served from, not where they are hosted. The dataset publishes shares, not per-network counts, and no per-network version split.
What no longer receives fixes
99.9% of the origins that report a version run a build that no longer receives fixes: 79.6% a Google-era build last updated in 2018, 20.3% an incubator-era build last updated in 2020. 22 origins report the current line. Update recommended.
The buckets follow the release history. Google-era builds run up to 1.13.35.2-stable, released on 5 February 2018, the last Google-era release. Incubator-era builds are the 1.14 line, last published as 1.14.36.1 in July 2020 from the Apache Incubator repository, which was archived in 2023, plus unreleased trunk builds from that repository. The current line starts at 1.15.0, released by We-Amp in June 2026. Origins that hide their version are not counted as out of date, so the true share across all PageSpeed origins is unknown in either direction.
This post lists no vulnerabilities. Builds before 1.15.0 no longer receive fixes; update recommended. Advisories and how to report a problem are on the security page.
How to get current
The census counts three-number versions from 1.15.0 on as the current line. It installs from the signed repository below.
curl -fsSL https://packages.modpagespeed.com/install.sh | sudo sh
Then install the module for your server; the download page has the per-server steps and the other channels. Later updates arrive through apt-get upgrade or dnf upgrade.
Open source under the Apache License 2.0.
If you run PageSpeed for customers, the hosting partner program adds fleet support and a direct channel. If you want a support agreement for your own sites, the pricing page lists the support tiers.
Method and data
In the September 2026 desktop crawl, 35,511 root pages send a PageSpeed header. Technology detection flags 28,743 pages, one of them without the header.
Signal
Root pages
Header and technology detection
28,742
Header only
6,769
Technology detection only
1
Detection misses roughly one in five pages that send the header. The headline and the series count detected origins, so those counts are floors. The cross-check covers the latest crawl only; earlier crawls were not checked. The full method is in METHODOLOGY.md, and the queries and tables are in the repository linked above.
The limits, in short:
HTTP Archive covers the sites in Chrome’s popularity data. The census measures that sample, not the whole web.
Hidden or altered headers and incomplete detection both make the counts floors on the real base.
Network shares describe the front-most address, not the hosting provider.
Where PageSpeed comes from
mod_pagespeed is an open-source project originally developed at Google. mod_pagespeed 2.1 is developed by We-Amp B.V. and is not affiliated with or endorsed by Google.