Jose Mortellaro

It will speed up the checkout of WooCommerce by deferring transactional emails.
In many environments the emails that are sent when the user places an order slow down the checkout process. 
Deferring those emails can drastically speed up the checkout in those cases.
The difference in terms of performance will be huge in some environments and not noticeable in others. 
Anyway, if you have a slow checkout, try this plugin. If the slowness was caused by the sending of the emails, you will probably solve the issue by deferring the emails.
To defer the transactional emails, just install this plugin and activate it. It has no settings.
<h3>How to speed up the WooCommerce checkout by deferring the transactional emails</h3>
<ul>
<li>Install Defer Transactional Emails for WooCommerce</li>
<li>Activate it</li>
</ul>
<h3>How to further speed up the checkout in WooCommerce</h3>
<ul>
<li>Install and activate <a href="https://shop.josemortellaro.com/downloads/checkout-speedup-for-woocommerce/" rel="nofollow ugc">Checkout Speedup For WooCommerce</a></li>
<li>Go to Checkout Speedup For WooCommerce => Main Settings => Disable the theme during the checkout process</li>
<li>Go to Checkout Speedup For WooCommerce => Main Settings => Defer the transactional emails</li>
<li>Go to Checkout Speedup For WooCommerce => Plugins active during checkout => Disable all the unneeded plugins that WordPress loads during the checkout process</li>
</ul>

Defer Transactional Emails for WooCommerce | Speed up the WooCommerce checkout

It will speed up the checkout of WooCommerce by deferring the transactional emails. No settings, just install it and activate it.

ShortPixel

With ShortPixel Critical CSS plugin, your website can automatically generate above-the-fold CSS for your web pages. 
This means your website will load faster and get better scores with online testing tools like PageSpeed Insights or GTmetrix.
IMPORTANT NOTICE: Plugin closure! 
We would like to inform you that the ShortPixel Critical CSS plugin and criticalcss.co service will be closed starting December 1st, 2024, and will no longer be available.
The Critical CSS functionality has now been integrated into the <a href="https://wordpress.org/plugins/fastpixel-website-accelerator/" rel="ugc">FastPixel Caching plugin</a>, and we highly recommend transitioning to this new plugin as soon as possible to ensure continued functionality and support.
If you have any questions, please feel free to contact us at <a href="mailto:help@shortpixel.com" rel="nofollow ugc">help@shortpixel.com</a>.
How it works?
<ul>
<li>ShortPixel’s Critical CSS (CCSS) plugin uses our brand new service to generate the critical CSS for your website’s pages.</li>
<li>The generated CCSS is inserted into the web pages while the original .css files are deferred. This makes the pages load faster.</li>
<li>The plugin starts generating the CCSS for each visited page and retrieves it from the ShortPixel Critical CSS Service. This is done using WP CRON jobs that run in the background without user intervention and without slowing down the website.</li>
<li>The edited pages will have the CCSS automatically generated.</li>
</ul>
Features
<ul>
<li>The CCSS plugin can be configured to keep Critical CSS rules based on the page URL or for each page template. This can help optimize the number of CCSS files needed.</li>
<li>Additional flexibility: the website administrator can manually configure additional Critical CSS rules to be included in the generated Critical CSS.</li>
<li>Our plugin integrates with WP Rocket and Elementor, if they are present, in order to leverage the cache support and deliver Critical CSS more effectively.</li>
</ul>
The plugin was forked from the <a href="https://wordpress.org/plugins/wp-criticalcss/" rel="ugc"> WP Critical CSS</a> plugin, modified to use ShortPixel’s Critical CSS service and enhanced with new features.
Currently, the plugin while in its BETA version, is 100% free to use. Just install it on your website, configure it and test the results with a tool like <a href="https://pagespeed.web.dev/" rel="nofollow ugc">Google PageSpeed Insights</a> or <a href="https://gtmetrix.com/" rel="nofollow ugc">GTMetrix</a>
For questions or support, please contact us directly <a href="https://shortpixel.com/contact" rel="nofollow ugc">here</a>
Other plugins by ShortPixel
<ul>
<li><a href="https://wordpress.org/plugins/fastpixel-website-accelerator/" rel="ugc">FastPixel Caching</a> – WP Optimization made easy</li>
<li><a href="https://wordpress.org/plugins/shortpixel-image-optimiser/" rel="ugc">ShortPixel Image Optimizer</a> – Image optimization & compression for all the images on your website, including WebP & AVIF delivery</li>
<li><a href="https://wordpress.org/plugins/shortpixel-adaptive-images/" rel="ugc">ShortPixel Adaptive Images</a> – On-the-fly image optimization & CDN delivery</li>
<li><a href="https://wordpress.org/plugins/enable-media-replace/" rel="ugc">Enable Media Replace</a> – Easily replace images or files in Media Library</li>
<li><a href="https://wordpress.org/plugins/regenerate-thumbnails-advanced/" rel="ugc">reGenerate Thumbnails Advanced</a> – Easily regenerate thumbnails</li>
<li><a href="https://wordpress.org/plugins/resize-image-after-upload/" rel="ugc">Resize Image After Upload</a> – Automatically resize each uploaded image</li>
<li><a href="https://wordpress.org/plugins/wp-svg-images/" rel="ugc">WP SVG Images</a> – Secure upload of SVG files to Media Library</li>
</ul>

ShortPixel Critical CSS

Easy to use and simple. Does what it says.

Working great!

Critical CSS plugin by ShortPixel to speed up your website. Easy to use, works on any website.

Defer Transactional Emails for WooCommerce | Speed up the WooCommerce checkout vs ShortPixel Critical CSS