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.
If familiar with web.config updates, doDynamicCompression is set to true as in the syntax example below.
<?xml version="1.0" encoding="UTF-8"?>
        <urlCompression doDynamicCompression="true" />
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.