mod_pagespeed
Apache module that automatically rewrites web pages to reduce latency and bandwidth by applying performance optimizations.
What is mod_pagespeed?
mod_pagespeed is an open-source Apache module created by Google that automatically rewrites web pages to reduce latency and bandwidth. It applies web performance best practices to pages and assets like CSS, JavaScript, and images without requiring modifications to existing content or workflows. The module helps make websites faster by optimizing resources and improving load times.
Web developers, system administrators, and hosting providers running Apache web servers who want to improve website performance without manual optimization efforts.
Developers choose mod_pagespeed because it automatically applies over 40 performance optimizations, is widely deployed across 100,000+ sites, and integrates seamlessly with Apache without requiring code changes. Its open-source nature and support from major hosting providers make it a reliable, hands-off solution for web speed improvements.
Overview
Apache module for rewriting web pages to reduce latency and bandwidth.
Use Cases
Best For
- Automatically optimizing images for faster page loads
- Minifying and concatenating CSS and JavaScript files
- Extending cache lifetimes to reduce server load
- Deferring non-critical resources to improve initial render time
- Reducing bandwidth usage for mobile or low-connection users
- Improving website performance without modifying existing code
Not Ideal For
- Websites hosted on non-Apache servers like Nginx or Microsoft IIS
- Developers who require fine-grained, manual control over each optimization step
- Projects using modern frontend build tools like Webpack or Vite that already handle optimization
Pros & Cons
Pros
Applies over 40 filters automatically to optimize images, CSS, and JavaScript without manual intervention, as stated in the README's feature list.
Deployed across 100,000+ sites and backed by major providers like DreamHost and GoDaddy, ensuring reliability and community trust.
Rewrites web pages transparently within Apache, so existing content and workflows remain unchanged, per the project's philosophy.
Includes diverse optimizations such as cache extension, domain sharding, and resource deferral, covering key web performance areas.
Cons
Exclusively works with Apache web servers, making it incompatible with Nginx, IIS, or other server environments without significant workarounds.
With numerous filters, tuning requires careful setup to avoid breaking site functionality or causing conflicts with dynamic content.
On-the-fly rewriting can add server load, potentially impacting performance for high-traffic sites if not properly optimized.
Frequently Asked Questions
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