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Speed Up – Optimize CSS Delivery vs Asynchronous Emails (2026)

Detailed side-by-side comparison of two WordPress plugins, based on real-time data from WordPress.org.

Speed Up – Optimize CSS Delivery

Speed Up – Optimize CSS Delivery

5(8)

1.0K+ active installs

Free

Updated 3 years ago
View Speed Up – Optimize CSS Delivery
VS
Asynchronous Emails

Asynchronous Emails

5(1)

10 active installs

Free

Updated 3 years ago
View Asynchronous Emails

Quick Verdict

As of April 2026, Speed Up – Optimize CSS Delivery has a higher user rating (5/5 from 8 reviews) and leads in active installations (1.0K+ vs 10). Both are free WordPress plugins. Speed Up – Optimize CSS Delivery has accumulated 59K+ total downloads while Asynchronous Emails has 1.3K+.

Detailed Comparison

Rating
5/5Speed Up – Optimize CSS Delivery
Asynchronous Emails5/5
Total Reviews
8Speed Up – Optimize CSS Delivery
◄
Asynchronous Emails1
Active Installs
1.0K+Speed Up – Optimize CSS Delivery
◄
Asynchronous Emails10
Total Downloads
59K+Speed Up – Optimize CSS Delivery
◄
Asynchronous Emails1.3K+
Support Resolution
N/ASpeed Up – Optimize CSS Delivery
Asynchronous EmailsN/A
Last Updated
3 years agoSpeed Up – Optimize CSS Delivery
◄
Asynchronous Emails3 years ago
First Released
2016Speed Up – Optimize CSS Delivery
Asynchronous Emails2023
Age
10 yearsSpeed Up – Optimize CSS Delivery
Asynchronous Emails3 years
WP Requires
3.5+Speed Up – Optimize CSS Delivery
Asynchronous Emails5.9+
PHP Requires
false+Speed Up – Optimize CSS Delivery
Asynchronous Emails7.4+
Business Model
FreeSpeed Up – Optimize CSS Delivery
Asynchronous EmailsFree
Latest Version
1.0.11Speed Up – Optimize CSS Delivery
Asynchronous Emails1.0.0

Rating Breakdown

Speed Up – Optimize CSS Delivery

5/5(8 reviews)
5
100%
4
0%
3
0%
2
0%
1
0%

Asynchronous Emails

5/5(1 reviews)
5
100%
4
0%
3
0%
2
0%
1
0%

Recent Reviews

Speed Up – Optimize CSS Delivery Reviews

by Wilson Santana

5 estrelas. Funciona muito bem.

Muito bom.

by mamadesign

This plug-in is a blessing

This plug-in is a blessing This plug-in is the best! We have to give a big prize to the person who created this plug-in. Thank you very much.

by castria

Works great!

Does what it says on the tin, which Google pagespeed likes a lot.

Asynchronous Emails Reviews

No reviews yet

Frequently Asked Questions

Is Speed Up – Optimize CSS Delivery or Asynchronous Emails more popular?
Speed Up – Optimize CSS Delivery has 1.0K+ active installations while Asynchronous Emails has 10. Speed Up – Optimize CSS Delivery is the more widely-used plugin as of April 2026.
Which has better ratings — Speed Up – Optimize CSS Delivery or Asynchronous Emails?
Speed Up – Optimize CSS Delivery has a 5/5 rating from 8 reviews, while Asynchronous Emails has a 5/5 rating from 1 reviews.
Are Speed Up – Optimize CSS Delivery and Asynchronous Emails free?
Speed Up – Optimize CSS Delivery is free and Asynchronous Emails is free. Both can be downloaded from the WordPress.org plugin directory.
Which plugin has better support — Speed Up – Optimize CSS Delivery or Asynchronous Emails?
Support resolution data is not available for all plugins. Check each plugin's WordPress.org support forum for current response quality.
Which plugin is updated more frequently?
Speed Up – Optimize CSS Delivery was last updated 3 years ago and Asynchronous Emails was last updated 3 years ago.

Plugin data sourced from WordPress.org. Comparison and analysis by PluginSift.