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Travis

mod_pagespeed is an open-source Apache module created by Google to help Make the Web Faster by rewriting web pages to reduce latency and bandwidth.

This fork exists to rebuild and revive mod_pagespeed for modern environments. The upstream/original project has seen long periods without active maintenance, while many production stacks still benefit from PageSpeed's optimization model.

Primary objective of this fork:

• Keep PageSpeed usable and buildable on modern toolchains.
• Continue feature updates for current web performance needs.
• Preserve backward compatibility where practical.

• AVIF image conversion support (convert_to_avif) for modern image delivery.
• LCP-oriented image prioritization filter to improve discoverability and fetch priority for above-the-fold/LCP candidates.
• Updated Google Analytics insertion support:
  • Supports modern Google tag IDs (GT-...) and GA4 measurement IDs (G-...) via gtag.js.
  • Preserves legacy Universal Analytics behavior for UA-... IDs.

Nginx example:

pagespeed on;
pagespeed FileCachePath /var/cache/ngx_pagespeed;

# AVIF conversion
pagespeed EnableFilters convert_to_avif;

# Prioritize likely LCP images
pagespeed EnableFilters prioritize_lcp_images;

# GA insertion (choose one ID format)
pagespeed EnableFilters insert_ga;
pagespeed AnalyticsID GT-XXXXXXX;   # modern Google tag
# pagespeed AnalyticsID G-XXXXXXX;  # GA4 measurement ID
# pagespeed AnalyticsID UA-XXXXXXX-Y; # legacy Universal Analytics

Quick checks:

# Verify AVIF rewrite path is generated in HTML.
curl -s http://localhost/ | grep -i avif

# Verify rewritten image response is AVIF.
curl -I -H 'Accept: image/avif,image/webp,*/*' \
  'http://localhost/path/to/image.jpg.pagespeed.ic....avif'

mod_pagespeed releases are available as precompiled linux packages or as source. (See Release Notes for information about bugs fixed)

mod_pagespeed is an open-source Apache module which automatically applies web performance best practices to pages, and associated assets (CSS, JavaScript, images) without requiring that you modify your existing content or workflow.

mod_pagespeed is built on PageSpeed Optimization Libraries, deployed across 100,000+ web-sites, and provided by popular hosting and CDN providers such as DreamHost, GoDaddy, EdgeCast, and others. There are 40+ available optimizations filters, which include:

• Image optimization, compression, and resizing
• CSS & JavaScript concatenation, minification, and inlining
• Cache extension, domain sharding, and domain rewriting
• Deferred loading of JavaScript and image resources
• and many others...

Curious to learn more about mod_pagespeed? Check out our GDL episode below, which covers the history of the project, an architectural overview of how mod_pagespeed works under the hood, and a number of operational tips and best practices for deploying mod_pagespeed.