Vlad

While being tailored for <a href="https://iplayerhd.com/cms/refer/10235175-966c-4d78-a75d-04c6159c0e02" rel="nofollow ugc">iPlayerHD Video Hosting</a> users, the plugin should work 
with any video which can be embedded via an iframe. Simply set the width and height attributes to fit 
your video’s format and you’re all set!
<a href="https://iplayerhd.com/cms/refer/10235175-966c-4d78-a75d-04c6159c0e02" rel="nofollow ugc">iPlayerHD</a> users can get a shortcode link with all of the required parameters 
automatically though the <a href="https://iplayerhd.com/cms/refer/10235175-966c-4d78-a75d-04c6159c0e02" rel="nofollow ugc">iPlayerHD</a> CMS.
<a href="https://iplayerhd.com/cms/refer/10235175-966c-4d78-a75d-04c6159c0e02" rel="nofollow ugc">iPlayerHD</a> users also get additional options such as playlist embeds and popup embeds.
<h4>Shortcode examples:</h4>
[iplayerhd src=”https://www.youtube.com/watch?v=dQw4w9WgXcQ”] – by omitting width and height parameters the video is embedded in 16:9 format
[iplayerhd src=”//iplayerhd.com/player/video/5ae4df93-5734-4e29-9f2e-15ff9056b7e4?cbartype=auto” width=”1024″ height=”768″]
<h4>Shortcode parameters:</h4>
<ul>
<li>src – source of the iframe, defaults to: http://iplayerhd.com/player/video/5ae4df93-5734-4e29-9f2e-15ff9056b7e4?cbartype=auto</li>
<li>width – width of video in pixels, defaults to 640 – if the video is in 16:9 format you can omit this parameter</li>
<li>height – height of video in pixels, defaults to 360 – if the video is in 16:9 format you can omit this parameter</li>
<li>popup – for <a href="https://iplayerhd.com/cms/refer/10235175-966c-4d78-a75d-04c6159c0e02" rel="nofollow ugc">iPlayerHD</a> users only – embeds a thumbnail which opens the video in a lightbox-style popup, defaults to ‘false’</li>
<li>player-mode – for <a href="https://iplayerhd.com/cms/refer/10235175-966c-4d78-a75d-04c6159c0e02" rel="nofollow ugc">iPlayerHD</a> users only – possible values: ‘video’, ‘playlistRight’, ‘playlistBottom’ – user for embedding iPlayerHD playlists, defaults to ‘video’</li>
</ul>

Free Responsive iframe Video Embeds

Use the [iplayerhd] shortcode to easily add responsive iframe-based video embeds to your website (YouTube, Vimeo, iPlayerHD and more...)

dbhynds

Lazy load images, YouTube and Vimeo videos, and iframes using <a href="https://github.com/ressio/lazy-load-xt" rel="nofollow ugc">Lazy Load XT</a>.
Lazy Load XT is the fastest, lightest, fully customizable lazy load plugin in the WordPress Plugin Directory.
This plugin works by loading the Lazy Load XT script and replacing the <code>src</code> attributes with <code>data-src</code> when the content of a post or page is loaded on the front end of a WordPress site.

Lazy Load XT

See this image
http://i.imgur.com/PzOIDGI.png
It's my main page's slider, it loads blank when installing this plugin
When the page loads at the first time without any cache, it loads with the browser's default font, then suddenly changed into the site's font. Not just the images in "not seen parts", but also images in the view port load blank. I would say this plugin has a huge potential, but at the moment, as it's not updated, it doesn't function as it advertises despite having 5/5 reviews.



Not really impressive as I thought

Lazy Load images, videos, iframes and more using Lazy Load XT.

Free Responsive iframe Video Embeds vs Lazy Load XT