That's all on the Ezoic end. Aside from Ezoic, you should also...
1. Decrease Image Sizes and Use JPG Format Images - I limit all images at 1500 pixels wide and then I use <strong>https://tinyjpg.com</strong> to reduce the size
2. Limit your site to only one font and check font speed (some are quicker to load than others) - Google fast web fonts and find one you like then only use that one on your site
3. Limit custom CSS - Keep CSS as streamlined as possible