Site slow to connect

I’ve created a few sites using wordpress and seem to run into the same problem each time, my sites run super slow. The content on pages seems to load fairly quickly but the initial connection to each page is very slow. If I use firebug to look at things in the net panel I can see the the majority of the load time is in the “waiting” phase. Here’s a link to the current site I’m working on (in progress). https://www.envirotechclean.com/hometesting/ Any advice would be greatly appreciated. Keep in mind, I’m fairy new to WP.