LiteSpeed Cache is an all-in-one WordPress performance plugin developed by LiteSpeed Technologies that combines server-level caching, front-end optimization, image compression, and database cleanup. Unlike PHP-based caching plugins, LiteSpeed Cache communicates directly with the web server’s built-in cache module, which means cached pages are served without loading PHP or querying the database — making it the fastest caching method available. The plugin includes page caching with smart purging, CSS and JavaScript minification and combination, critical CSS generation, image optimization with WebP and AVIF conversion, lazy loading, and a database cleaner. It also provides a QUIC.cloud CDN service with free tier for sites running on any server. With over 135 million downloads and a 4.8-star rating, LiteSpeed Cache is the most downloaded caching plugin on WordPress.org, competing directly with WP Rocket and FlyingPress.
The cache features require a LiteSpeed web server or QUIC.cloud CDN, but the optimization features — minification, image optimization, database cleanup — work on any hosting environment.
Competitive Features
- Server-level caching — fastest caching method available, bypassing PHP and database entirely
- Image optimization — lossless and lossy compression with automatic WebP and AVIF conversion
- Critical CSS — automatic generation of above-the-fold CSS with inline delivery
- CSS/JS minification — combine, minify, and defer CSS and JavaScript with granular file control
- Lazy loading — defer off-screen images, iframes, and videos with responsive placeholder support
- Database cleaner — clean up post revisions, auto-drafts, spam, trashed posts, and transients
- QUIC.cloud CDN — free CDN service with image optimization and critical CSS generation
Key Features
- Page caching — automatic cache with tag-based smart purging when content changes
- Object cache — Memcached, Redis, and LSMCD support for database query result caching
- ESI (Edge Side Includes) — cache dynamic widget content (cart, user menu) separately from static page content
- Smart crawler — preload the cache after purges using SEO-friendly sitemap-based crawling
- HTTP/2 Push — push critical CSS and JS resources for faster page rendering
- Cloudflare API — manage Cloudflare cache and APO settings directly from WordPress
- Heartbeat control — reduce server load by controlling the WordPress heartbeat API
Comparison with Competitors
LiteSpeed Cache vs WP Rocket
| Aspect | LiteSpeed Cache | WP Rocket |
|---|---|---|
| Caching method | Server-level (LiteSpeed) | PHP-based |
| Image optimization | Yes (built-in) | No (add-on via Imagify) |
| Critical CSS | Yes (free) | Via add-on |
| CDN | QUIC.cloud (free tier) | Third-party only |
| Database cleanup | Yes | Yes |
Bottom line: LiteSpeed Cache offers more features for free, including image optimization, critical CSS, and CDN. WP Rocket works on any server without special requirements. On LiteSpeed servers, LiteSpeed Cache is faster due to server-level caching.
LiteSpeed Cache vs FlyingPress
| Aspect | LiteSpeed Cache | FlyingPress |
|---|---|---|
| Server-level caching | Yes | No |
| Image optimization | Yes | No |
| Critical CSS | Yes | Yes |
| CDN | QUIC.cloud | Bunny.net (included) |
| Delay JavaScript | Yes | Yes |
| Database cleanup | Yes | Yes |
Bottom line: FlyingPress includes a CDN and is simpler to configure. LiteSpeed Cache offers more features for free, but reaches full potential on LiteSpeed servers.
Recommended Stack: LiteSpeed Cache handles caching and optimization on LiteSpeed servers. For additional image compression options, pair with ShortPixel.
Official Changelog
Data sourced from WordPress.org plugin repository.
Version 7.9.1
Release Date: September 1, 2026
- Core: Aligned the runtime PHP and WordPress guards with the published minimum requirements.
- ESI: Prevented Guest Mode pages from creating ESI subrequests when an integration registered its ESI hooks before Guest Mode detection.
- ESI: Bound ESI execution to the signed query payload so POST parameters cannot replace validated block data.
- Image Optimize: Fixed a fatal error when the WordPress HTTP fallback could not download an image.
- Image Optimize: The image optimization callback is now verified by a QUIC.cloud signature instead of the source IP address.
Version 7.9
Release Date: August 5, 2026
- New critical CSS generation with improved selector extraction for block themes.
- Enhanced image optimization with AVIF lossy compression support.
- Fixed QUIC.cloud CDN purge conflict with Cloudflare APO.
Version 7.8.1
Release Date: July 12, 2026
- Added delay JavaScript execution with user interaction timeout.
- Improved ESI cache handling for WooCommerce cart widgets.
- Fixed database optimizer memory limit for large site tables.
Frequently Asked Questions
Is LiteSpeed Cache really free?
Yes. LiteSpeed Cache is completely free and open source. The cache features require a LiteSpeed server or QUIC.cloud CDN, but the optimization features work on any server at no cost.
Does LiteSpeed Cache work on non-LiteSpeed servers?
The optimization features — image optimization, CSS/JS minification, critical CSS, database cleanup, lazy loading — work on any server. The caching features require a LiteSpeed server, OpenLiteSpeed, or QUIC.cloud CDN.
How does LiteSpeed Cache compare to WP Rocket?
LiteSpeed Cache offers more features for free, including server-level caching, image optimization, and critical CSS. WP Rocket is easier to set up and works on any server without special requirements.
Can I use LiteSpeed Cache with a CDN?
Yes. LiteSpeed Cache integrates with QUIC.cloud CDN (free tier available), Cloudflare, and other CDN services. The QUIC.cloud CDN also provides image optimization and critical CSS services.
Does LiteSpeed Cache support WebP?
Yes. LiteSpeed Cache includes built-in WebP and AVIF conversion with automatic delivery to supported browsers using picture tags.
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