After activating the plugin and enabling cache site is not faster

I have setup this plugin however the site does not seem to be any faster after activating the cache and putting in various options (like minifying css/gzip etc.). I have visited the site to have it cached and I don’t know how to check if the plugin is working correctly.

I have created a video below of my issue:
https://cl.ly/82a38df9532e

Best,
Kosta

The page I need help with: [log in to see the link]