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Showing content from https://developers.google.com/speed/docs/insights/EnableCompression below:

Enable Compression | PageSpeed Insights

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This rule triggers when PageSpeed Insights detects that compressible resources were served without

compression.

All modern browsers support and automatically negotiate

compression for all HTTP requests. Enabling

compression can reduce the size of the transferred response by up to 90%, which can significantly reduce the amount of time to download the resource, reduce data usage for the client, and improve the time to first render of your pages. See

to learn more.

Enable and test gzip compression support on your web server. The HTML5 Boilerplate project contains

for all the most popular servers with detailed comments for each configuration flag and setting: find your favorite server in the list, look for the

section, and confirm that your server is configured with recommended settings. Alternatively, consult the documentation for your web server on how to enable compression:

• Apache: Use mod_deflate
• Nginx: Use ngx_http_gzip_module
• IIS: Configure HTTP Compression

PageSpeed Insights reports that many of my static content files need to be gzipped, but I have configured my web server to serve these files using gzip compression. Why is PageSpeed Insights not recognizing the compression?

Proxy servers and anti-virus software can disable compression when files are downloaded to a client machine. PageSpeed Insights' results are based on headers that were actually returned to your client, so if you are running the analysis on a client machine that is using such anti-virus software, or that sits behind an intermediate proxy server (many proxies are transparent, and you may not even be aware of a proxy intervening between your client and web server), they may be the cause of this issue.

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Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2024-09-03 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2024-09-03 UTC."],[[["This documentation applies to a deprecated version of PageSpeed Insights (v4) and will be shut down soon; users should refer to the latest version (v5)."],["The primary focus of this document is to explain how enabling GZIP compression can significantly improve website performance by reducing file sizes."],["PageSpeed Insights may report compression issues due to interference from proxy servers or anti-virus software affecting the headers returned to the client."],["Modern browsers inherently support GZIP compression, so enabling it on your web server is crucial for optimization."],["This page offers guidance and links to resources on how to enable GZIP compression for various web servers like Apache, Nginx, and IIS."]]],["PageSpeed Insights flags resources served without `gzip` compression, which can reduce response size by up to 90%. Modern browsers support `gzip`, improving download time and data usage. To resolve this, enable and test `gzip` on your server, using tools like `mod_deflate` for Apache, `ngx_http_gzip_module` for Nginx, or configure HTTP compression in IIS. Proxy servers or anti-virus software can interfere with compression, impacting PageSpeed Insights' results.\n"]]

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