Great little add-on, works out of the box exactly as expected. This should really be incorporated as a standard part of c5, thank you very much for the author who has taken it upon himself to fill the void in the mean time :-)

It does what it says

Google Pagespeed Insights is a very imporant metric in measuring the speed of your site.
Minify HTML helps gain a higher Pagespeed score which is great for SEO and for user experience and satisfaction.

Here are before and after scores for a website we used the add on with:
Before:
Mob 69 | Desktop 83

After:
Mob 72 | Desktop 87