Enable Gzip and Brotli compression to improve website performance. The configuration steps are as follows: 1. Enable static and dynamic content compression in IIS; 2. Modify the web.config file to enable Gzip compression and adjust dynamic compression settings; 3. Download and install the Brotli module and configure the relevant MIME types; 4. Use the browser developer tools to verify whether Content-Encoding is effective; 5. Pay attention to issues such as MIME type coverage, cache impact, HTTPS compatibility, and server resource occupancy. After correct configuration, it can effectively reduce the amount of data transmitted and speed up page loading.

Enabling Gzip and Brotli compression can significantly reduce the amount of data transferred by the website, thus speeding up page loading. Configuring these two compression methods in IIS (Internet Information Services) is not complicated, but you need to pay attention to some details, otherwise the expected results may not be achieved.

Configure Gzip compression

IIS comes with support for Gzip compression, just need to be enabled and configured correctly.

• Enable static and dynamic content compression
  Open Server Manager → Add Roles and Features → Ensure that "Static Content Compression" and "Dynamic Content Compression" are checked in "Performance" under "Web Server (IIS).".

• Modify the web.config file
  Add the following configuration to the web.config file in the root directory of your website:

  

 <configuration>
  <system.webServer>
    <urlCompression doStaticCompression="true" doDynamicCompression="true" />
  </system.webServer>
</configuration>

• Note : Dynamic compression only compresses smaller responses (such as JSON) by default. If you want to compress larger responses, you need to adjust dynamicCompressionBeforeCache settings.

Enable Brotli compression

Brotli is a more efficient compression algorithm than Gzip. IIS does not support it by default and requires manual installation of modules.

• Download and install Brotli module
  The URL Rewrite and Dynamic Content Compression modules for IIS can be downloaded from Microsoft, or a third-party implementation using the IIS Compression Tool .

• Configure Brotli compression
  After the installation is complete, add the following content to web.config :

 <configuration>
  <system.webServer>
    <urlCompression doStaticCompression="true" doDynamicCompression="true" dynamicCompressionBeforeCache="true">
      <staticTypes>
        <add mimeType="text/*" enabled="true" />
        <add mimeType="application/javascript" enabled="true" />
        <add mimeType="application/json" enabled="true" />
        <add mimeType="*/*" enabled="false" />
      </staticTypes>
      <dynamicTypes>
        <add mimeType="text/*" enabled="true" />
        <add mimeType="application/json" enabled="true" />
        <add mimeType="*/*" enabled="false" />
      </dynamicTypes>
    </urlCompression>
  </system.webServer>
</configuration>

• Verify whether it is effective
  Use the browser developer tool to view the Content-Encoding field in the network request header. If it is displayed as br or gzip , compression is enabled.

Notes and FAQs

Some settings are easily overlooked, causing compression to not work as expected:

• MIME type not included
  If some file types are not added to the staticTypes or dynamicTypes list, they will not be compressed by default.

• Cache affects test results
  The browser or CDN cache may return old data, and it is recommended to disable cache or clear it before testing.

• HTTPS has no effect on compression
  Many people mistakenly believe that compression under HTTPS will fail. In fact, as long as the configuration is correct, encryption or not will not affect the compression logic.

• Server resource occupation
  Dynamic compression will increase CPU usage, especially in high concurrency scenarios. It is recommended to choose whether to turn on based on the actual load.

Basically that's it. Both Gzip and Brotli can effectively improve website performance, and there is almost no additional maintenance required after reasonable configuration, but make sure that every step is checked in place when setting it up for the first time.

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