Essential WordPress plugins for building fast loading optimized websites.
Plugins that help score high with GT-Metrix
Every site is different and Autoptimize does take a little tinkering to get the settings right. My suggestion is to make 1 change then check for js errors.
BJ Lazy Load
Lazy loading makes your site load faster and saves bandwidth.
This plugin replaces all your post images, post thumbnails, gravatar images and content iframes with a placeholder and loads the content as it gets close to enter the browser window when the visitor scrolls the page. Lazy loading and easily be added with just a few lines of code as well see this post lazy load Script see post
GT Metrix Image Optimization Losslessly compressing
Admin Column Pro