This plugin might be excellent. And, I greatly appreciate dev efforts for this plugin.
Past a few months back, I had seen lots of 5-star reviews for that particular plugin. So, I had thought, it would make even more, faster than WP Rocket and WP Super Cache, but sorry to say it didn't work as expected. I uninstalled it within 45 mins.
I recommend WP Super Cache in the free version and for more better performance WP Rocket.
I have also heard good reviews about Comet Cache; I've not tried it.