Enable gzip compression in IIS

gzip compression may be enabled either directly through a web.config or by connecting to the site using IIS Manager.  

web.config

<?xml version="1.0" encoding="UTF-8"?>

<configuration>

    <system.webServer>

        <urlCompression doDynamicCompression="true" />

    </system.webServer>

</configuration>

  

IIS Manager

 To make the update through IIS Manager, instead; connect to the site then double click the Compression module.

 Click the checkbox next to "Enable dynamic content compression" then click Apply to enable gzip.