#5 by installs
LiteSpeed Cache
All-in-one unbeatable acceleration & PageSpeed improvement: caching, image/CSS/JS optimization...
- Installs
- 7+ million
- Rating
- 4.8 (2.8K)
- Updated
- 11 days ago
Speed Optimizer – The All-In-One Performance-Boosting Plugin
Boost your website performance and page speed, and increase conversions with powerful caching, frontend, media, and environment optimizations.
- Active installs
- 1+ million
- #44 of 1,000
- Downloads, all time
- 109.8M
- 109,772,622
- Downloads, 30 days
- 2.6M
- 38.4K in the last 7
- Rating
- 4.2 / 5
- 641 reviews
- Last updated
- 11 days ago
- Oct 20, 2026
- Version
- 7.8.5
- 24 releases
Upkeep and compatibility
| Last updated | October 20, 2026Updated in the last 3 months |
|---|---|
| Tested up to | WordPress 7.1.4Covers WordPress 7.1.4, the current release |
| Needs WordPress | 5.5.1 or newer |
| Needs PHP | 7.0 or newer |
| First published | November 25, 2014 |
| Support, last two months | 6 of 9 threads resolved (67%) |
Reviews
4.2 / 5 from 641 reviews
| 5 stars | 462 |
|---|---|
| 4 stars | 26 |
| 3 stars | 34 |
| 2 stars | 27 |
| 1 star | 92 |
Downloads, last 30 days
What the author says it does
The award-winning Speed Optimizer plugin is a free WordPress performance-boosting solution to improve user experience, increase conversion rates and drive more traffic. Achieve better SEO rankings, improve Core Web Vitals and enhance your Google Page Speed Score.
Developed by the WordPress speed experts at SiteGround, our free plugin is actively used and trusted by more than 2 million website owners. It’s specially designed to be easy to use, allowing users of all skill levels to make complex speed optimizations, such as minifying HTML, CSS and JavaScript, image compression and lazy loading, in a few clicks.
Install our caching plugin now to dramatically improve your WordPress website performance on any hosting platform.
Essential Speed-boosting Features:
- Powerful Caching for up to 20% faster website.
- Frontend Optimizations to minify JS, HTML and CSS, reducing wait time due to the number of scripts and characters in your code
- Media Optimizations by up to 85% image size compression without sacrificing quality
- WordPress Environment Optimizations to optimize usage and efficiency of your WordPress site resources
- Speed Test & tips to get on-demand optimization tips to help your site get even faster
Don’t let a slow website compromise your online success. Join the millions of satisfied website owners and see the difference with the free Speed Optimizer plugin.
The opening of the plugin's own description. The full text, installation notes and changelog are on its WordPress.org page.
Latest changelog entry
Release Date: Oct 20th, 2026
- Third-Party plugins compatibility improvements
- Plugin translations download improvements
- File Cache URL preheat improvements
- Memcache improvements
- Security improvements
• Multisite support improvements
• Acknowledgments: We would like to thank Karthik Ramakrishnan for responsibly disclosing two security issues.
Screenshots
The SiteGround Optimizer Dashboard Page offers a quick look at the current optimization status of your website, along with shortcuts to… 
The SiteGround Optimizer Caching Page handles your Dynamic caching and Memcached. Here, you can exclude URls from the cache, test your… 
The SiteGround Optimizer Environment Page, you can force HTTPS for your site, tweak the WordPress Heartbeat Optimization, pre-fetch… 
The SiteGround Optimizer Frontend Optimization Page allows you to Minify HTML, CSS & JS, as well as to remove query strings from your…
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Where this page's numbers come from
Read from the WordPress.org plugin API on , when WordPress 7.1.4 was the current release. WordPress.org rounds active installs into buckets. These are the directory's figures, not my verdict, and I haven't tested this plugin.