Minifying your HTML can improve your PageSpeed Score, decrease your page’s render and load times, and reduce your overall page size.
By reducing the size of the HTML files used to build your webpage, you can speed up your site’s page load times and make the download less expensive (in terms of data usage and browser work) for your user.
Plus, you will cut down on:
The amount of time required by the browser to download the resource
The amount of time required by the browser to parse the file and build the DOM tree