Lazy loading for images and iframes makes your site load faster and saves bandwidth. Uses no external JS libraries and degrades gracefully for non-js
Iframe Preserver plugin allows you to easily embed any iframe and preserves your embedded iframes by utilizing WordPress' Custom Fields.
WP no-iFrames (Content Protection) is a simple, yet effective iframe breaking plugin that protects your site content from being embedded into other si
Automatically add iFrame placeholder images, reduce page requests, decrease load time!
Url Giver is a plugin which lets you display hidden urls on the posts you wish.