WordPress懒加载图片插件 a3 Lazy Load，只有在图片出现在当前页面视窗中时，才下载图片，可以减少服务器的压力，提高页面加载速度，避免不必要的资源下载。
a3 Lazy Load is a Mobile Oriented, very simple to use plugin that will speed up sites page load speed. The more content heavy your site the better the plugin will perform and the more you will see the improvements in performance. See this demo of a page with 1,000 images (yes 1,000 images) to load.
a3 Lazy Load is the most fully featured, incredibly easy to set up lazy load plugin for WordPress. Use the plugins admin settings to easily define what elements are lazy loaded and when they become visible in the users browser. As the user scrolls down the page the next lot of elements you have applied lazy Load to are only loaded as they become visible in the view port.