mod_deflate

In Linux systems, mod_deflate is used to compress HTTP content before it is served to the client; this results in faster network transfers.
 

Compressing Content

Apache 2.0, 2.2, and 2.4 allow you to compress content using mod_deflate before sending it to the visitor's browser. The types of content to be compressed are specified by MIME type. The mod_deflate module provides similar functionality as mod_gzip.

Mod_deflate is available on all our Linux based hosting packages, including Shared, Reseller, VPS, and Dedicated Server plans.

You can enable or disable it in cPanel by doing the following:

1. Log in to cPanel.
2. In the Software section, click on Optimize Website.

   

3. Under Compress Content, select the appropriate option:
   • To disable compression of your website’s content, select Disabled 
   • To compress all of your website’s content, select Compress All Content
   • To specify a list of types of content to compress, select Compress the specified MIME types. Enter a space-separated list of the types of content that you wish to compress in the MIME Types text box (for example, text/html text/plain text/xml).
     Note:

     • Do not include any image file formats in the list. Image file formats (for example, .jpg and .png) already compress data. 
     • Apache will compress PHP content if you enable the zlib.output_compression setting in cPanel’s MultiPHP INI Editor interface.
     • For more information, view For more information, view Proper MIME Types

   

4. Click Update Settings.

Additional Information

To learn more about the mod_deflate module, read the documentation for your server’s version of Apache:

• Apache 2.0 web server documentation for mod_deflate.
• Apache 2.2 web server documentation for mod_deflate.
• Apache 2.4 web server documentation for mod_deflate.

In addition, the following resource from GTmetrix is useful for understanding which rules to put in place:

• PageSpeed: Enable compression