PI Web Solution

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Push / Pre-load all JS files in site with one simple option
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Push / Pre-load all the CSS files in your website
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Push / Pre-load other resources throughout the site or based on the page types
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Load CSS Asynchronous or Remove any CSS file throughout the site, or there is a conditional selector that you can apply
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Async / Defer / Remove any JS file throughout the site or based on the WordPress page type
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You can create mobile device specific rule to push, pre-load, remove, async js or css, this works based on the device user agent detection
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You can create desktop device specific rule to push, pre-load, remove, async js or css, this works based on the device user agent detection
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Conditionally remove JS and CSS from various WooCommerce pages like checkout page, cart page, product page, product category page
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You can push pre-load resource specific on some pages by their ID
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Remove CSS, JS specific to page or post by their ID
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Organize rules in group for easy management of the rules
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Remove CSS, JS on all pages leaving only on the page you specified
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optimize WooCommerce speed
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optimize WordPress website speed
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<iframe loading="lazy" title="Http2 push preload plugin working for WordPress" width="750" height="422" src="https://www.youtube.com/embed/GHGclxgbSqI?feature=oembed" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
<blockquote>
Mobile and Desktop detection works based on the wp_is_mobile() function of the WordPress that detect device based on the user agent data send in the request
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Apart from this it also offer ability to remove Css and JS file from specific pages based in the selected page tag conditions
Eg: if css path is https://s.w.org/style/wp4.css
then you can match it with wp4.css or style/wp4.css or s.w.org/style/wp4.css
you use 2nd method (style/wp4.css) for more precise selection (this avoid error when there are 2 style with same file name)

Page Speed Optimizer: HTTP/2 Push, Async JavaScript, and Defer CSS

My websites are entirely in AMP, but this plugin injects non-AMP scripts on evey page. It doesn't even try to inject scripts only in non-AMP. So, kinda useless for me. I hope to give it another try in the future.

Not compatible with AMP

It is one of my mandatory plugins, I always use it. :)

Simple, handy and must-have :)

HTTP2 Server push, Async JavaScript, Defer Render Blocking CSS, with fine rule set to control js and css on different page types,

Derrick Hammer

This plugin will combine all inline and external CSS in the order found on the page and save it to WP-Rocket’s cache folder as a new file. Files with media attributes are wrapped in <code>@media</code> selectors during processing. Async is powered by <a href="https://github.com/filamentgroup/loadCSS" rel="nofollow ugc">https://github.com/filamentgroup/loadCSS</a>.
If you are looking for a professional team to get your WordPress site to run faster, check us out for our speed optimization, google my business, seo and local seo services at <a href="https://rankgrowdigital.com/" rel="nofollow ugc">Rank Grow Digital</a>
Filters <code>rocket_async_css_process_style</code> and <code>rocket_async_css_process_file</code> can be used to selectively exclude any inline CSS or external CSS from minify and async loading.
Examples are:
<pre><code>function exclude_css($skip, $css){
 if ( false !== strpos( $css, 'something' ) ) {
 return false;
 }

 return $skip;
}
add_filter('rocket_async_css_process_style','exclude_css', 10, 2);
</code></pre>
and
<pre><code>function exclude_file($skip, $url){
 if ( 'some url' == $url ) {
 return false;
 }

 return $skip;
}
add_filter('rocket_async_css_process_style','exclude_file', 10, 2);
</code></pre>

WP Rocket ASYNC CSS

WordPress plugin to combine all inline, external, and remote CSS and load async. Depends on WP-Rocket

This is NOT an official addon to WP-Rocket!

Page Speed Optimizer: HTTP/2 Push, Async JavaScript, and Defer CSS vs WP Rocket ASYNC CSS