This plugin is a masterwork. With some tweaks you can speed up your Oxwall website to get 95-100 in score at google page speed insight tool. But there is many things you need to find out you self how this plugin works before you can start use it. And the developer decide to leave the project and that brings down the rate a little.
Although the plugin seems to work fine, I need to speak to the DEV that created it to optimize it. Maybe is on vacation , maybe he is on sickness leave, maybe he does not work here anymore, in any of these cases, he does not provide answers or support.