Plugin Icons Missing on Backend and front end

Hello I’m new to wordpress. The plugin really helped my gtmetrix and yslow scores drastically however, when activated google speed insights sends back an error and states “An error occurred while fetching or analyzing the page.” and this goes away when plugin is deactivated. Also icons in my backend for plugins such as jet pack, woocommerce, products disappear and become little box outlines. On my frontend my search and cart icons are either box outlines as well or my search icon changes into a pair of red lips and the cart turns into a hammer on the mobile device display. Im sure that the plugin is not suppose to do this. It makes the site look broken from a customer stand point. Please advise.