Thoog_10

Rather than embedding video after video on a page or post, this plugin allows the user to consolidate those video embeds into a list that plays within one div.
<ul>
<li>This lets the user keep all their video embeds in one place, the Async Vid List settings page.</li>
<li>The presentation is more aesthetically pleasing to the viewer.</li>
<li>Only the video that is clicked on is loaded.</li>
</ul>
Multiple lists can be used on any page or post (or even sidebars) using the shortcode and the list ID.
The CSS is intentionally kept simple – feel free to customize it per your theme.
This plugin only uses one row in the wp_options table, so there is no database bloat.

Async Vid List

Lets the user create lists of video embeds that load and play asynchronously in one div

nigro.simone

This small plugin (5 Kb) loads the stylesheets asynchronously and improve page load times.
The recommended use of this plugin is to load your vital stylesheets synchronously and non-vital CSS files asynchronously. 
Non-vital CSS-files can be for example: fonts, icons, before the fold template-specific CSS, etc.
You can choose which files to load synchronously with a filter in your function.php, eg.:
<pre><code>// exclude main and child stylesheets from delivery optimization
function exclude_from_delivery_optimization($handle){
 return in_array($handle, array('main-stylesheet', 'child-stylesheet'));
}
add_filter('speed-up-optimize-css-delivery', 'exclude_from_delivery_optimization');
</code></pre>
Note: this only works if your other plugins and theme add the CSS correctly.

Speed Up – Optimize CSS Delivery

This plugin load the stylesheets asynchronously and improve page load times.

Async Vid List vs Speed Up – Optimize CSS Delivery