You've been hard at work optimizing your site. You've already done things like lazy-loading Google Maps and been wondering if there was anything else you could do. For example, is there anything we can do to improve the loading of ads? Good news, there is some things you can do. You can respect user's mobile data plan by loading ads only when they are likely to appear in the viewport zone. You can also serve ads in the right size in accordance to the screen of the device. That would be nice of you. That would not only be responsive but also responsible.
I've written an article on that and got it published on CSS-Tricks.