mod_pagespeed 1.15 Documentation

Everything you need to install, configure, and run mod_pagespeed 1.15 on nginx, Apache, IIS, and Envoy.

Starting a new deployment? ModPageSpeed 2.0 is the current flagship — a Docker reverse proxy in front of any origin, or ASP.NET Core middleware. Stay on 1.15 to keep an in-process module for Apache, nginx, IIS, or Envoy.

Getting Started

Install mod_pagespeed 1.15 on nginx, Apache, IIS, or Envoy: package repo or direct download, signature verification, license activation, and how to confirm optimization is running.

Upgrading from open-source mod_pagespeed

Move from the archived open-source mod_pagespeed to the maintained 1.15 release on nginx, Apache, or IIS. Drop-in compatible — your config, filters, and .htaccess rules keep working.

Downloads & Licensing

Download mod_pagespeed 1.15 packages for nginx, Apache, and IIS. Pre-built .deb, .rpm, and .msi binaries. Install and run to evaluate; production use requires a commercial license; the software never locks you out.

What's New in 1.15

Everything that changed since the last open-source release of mod_pagespeed (2020). Security patches, Cyclone Cache, multi-platform support, and more.

Release Notes

mod_pagespeed 1.15 release notes — the maintained successor to the final open-source release (1.14.36.1, the last from the Apache incubator). Full version history, security and reliability updates.

ASP.NET Core

ASP.NET Core Sidecar (NuGet)

Add mod_pagespeed 1.15 to an ASP.NET Core app with two lines of middleware. WeAmp.PageSpeed.Sidecar runs a bundled nginx + ngx_pagespeed optimizer on loopback behind your Kestrel app. Linux-only (linux-x64, linux-arm64), with AddPageSpeed()/UsePageSpeed() wiring and a full options reference.

Configuration

Configure mod_pagespeed 1.15 for nginx, Apache, IIS, and Envoy: enabling the module, module states, core directives, per-location and virtual-host scoping, and reverse-proxy setup.

Filter Selection

Choose which mod_pagespeed 1.15 filters to run: RewriteLevel presets, the CoreFilters default set, EnableFilters, DisableFilters, ForbidFilters, and tuning thresholds.

Domain Configuration

Authorize and map domains in mod_pagespeed 1.15 on nginx, Apache, and IIS. Reference for the Domain, MapOriginDomain, MapRewriteDomain, MapProxyDomain, ShardDomain, and LoadFromFile directives.

HTTPS Configuration

Fetch HTTPS resources in mod_pagespeed 1.15 on nginx, Apache, and IIS: FetchHttps with SSL certificate verification, MapOriginDomain to an HTTP backend, or LoadFromFile.

Caching: Cyclone, Memcached, Redis

Configure caching in mod_pagespeed 1.15. Cyclone Cache (default), Memcached and Redis integration, shared memory metadata, cache purging, and IPRO.

Filters

Filters Overview

The complete mod_pagespeed 1.15 filter set, grouped by category — image, CSS, JavaScript, HTML, and caching filters — with what each one does and how to enable it.

Image Filters

Configure image optimization filters in mod_pagespeed 1.15 for Apache, nginx, and IIS: recompression, WebP conversion, resizing, lazy loading, and responsive images.

CSS Filters

Reference for CSS optimization filters in mod_pagespeed 1.15: minify, combine, inline, and flatten @import CSS, plus critical-CSS extraction. Apache, nginx, and IIS syntax with tuning parameters.

JavaScript Filters

Minify, combine, inline, and defer JavaScript in mod_pagespeed 1.15. Directives, defaults, and the trade-offs for each JS filter on Apache, nginx, and IIS.

HTML Filters

HTML optimization filters in mod_pagespeed 1.15: collapse whitespace, strip comments, elide attributes, DNS prefetch, and resource preload hints.

Caching & URL Filters

Cache-extension and URL-management filters in mod_pagespeed 1.15: extend_cache for 1-year content-hashed caching, extend_cache_pdfs, rewrite_domains for CDN and sharding, and local_storage_cache.

Operations

mod_pagespeed Admin Console

mod_pagespeed 1.15 admin console: statistics, cache inspection, message history, and config. Setup and access control for nginx, Apache, and IIS at /pagespeed_admin/.

Security

Security guidance for mod_pagespeed 1.15: restricting admin pages, domain authorization, untrusted content, CSS/XSS, cache poisoning, HTTPS, and CVE patching.

Troubleshooting

Fix common mod_pagespeed 1.15 problems: a missing X-Mod-Pagespeed header, 404s on optimized resources, broken layout or JavaScript, cache and memory issues, and how to read .pagespeed. URLs and debug markers.

IIS

IIS Tuning

IIS performance tuning for mod_pagespeed 1.15 on Windows Server: request filtering for combined resources, static vs dynamic gzip, MIME types, CDN and ARR caching, and TCP slow start — all via web.config.

IIS Configuration

Configure mod_pagespeed 1.15 on IIS via pagespeed.config — the native IIS module and successor to IISpeed. Directive syntax, path-based regex matching, server and site-level config, and environment-variable expansion.

Reference

PageSpeed Filter Reference

Every PageSpeed filter in mod_pagespeed 1.15 — all 62, with category, CoreFilters and OptimizeForBandwidth status, a safety rating, and a one-line description. nginx, Apache, and IIS syntax included.

mod_pagespeed Directive Index (Apache & nginx)

Alphabetical reference of every mod_pagespeed 1.15 configuration directive — Apache and nginx syntax, default values, and links to the full caching, image, CSS/JS, and domain docs.

mod_pagespeed 1.15 FAQ

Answers on mod_pagespeed 1.15: installation, configuration, licensing, Cyclone Cache, filters, troubleshooting, and how 1.15 compares to ModPageSpeed 2.0.

PageSpeed markers

What the .pagespeed. URLs, data-pagespeed-* attributes, and X-Page-Speed header on an optimized page mean.

cPanel / EasyApache 4

Install, uninstall, and maintain mod_pagespeed 1.15 on cPanel / EasyApache 4: the signed EA4 RPM, enabling it in WHM Customize, the cpanel/elevate OS-upgrade runbook, and how the Apache Module Magic Number keeps routine ea-apache24 updates from breaking the module.