Ask ten WordPress people which free caching plugin to install and you’ll get ten answers, half of them wrong for your particular setup. LiteSpeed Cache and WP Fastest Cache are two of the most popular going: both free, both with millions of installs, but built for different worlds. Pick the wrong one and you’ll either waste an afternoon or quietly leave speed on the table.
Here’s the honest version, from someone who installs these on client sites for a living.
The short answer
It comes down to one thing: what web server your host runs.
- On LiteSpeed hosting → LiteSpeed Cache, no contest. It’s free and genuinely one of the fastest caches there is.
- On anything else (standard Apache or Nginx) → WP Fastest Cache is the simpler, more reliable pick, because LiteSpeed Cache’s best features simply won’t fire.
Everything below is the why.
The one question that settles it
LiteSpeed Cache does its heavy lifting at the server level, using a technology called LSCache that only exists if your host runs the LiteSpeed web server (or its free cousin, OpenLiteSpeed). On a normal Apache or Nginx host you can still install LiteSpeed Cache, but the good stuff is greyed out or handed off to LiteSpeed’s separate QUIC.cloud service.
So before you touch either plugin: are you on LiteSpeed? Ask your host, or check your site’s response headers for an x-litespeed-cache line. Plenty of budget and managed hosts run LiteSpeed without shouting about it, so it’s worth two minutes to find out.
LiteSpeed Cache: the powerhouse (if you’re on LiteSpeed)
On the right host, LiteSpeed Cache is almost unfairly good for a free plugin. In one download you get server-level page caching, image optimisation, CSS/JS minification with critical CSS, lazy loading, database cleanup, and a proper CDN via QUIC.cloud. Paid plugins charge for half of that.
The catch is the server requirement. Off LiteSpeed, you’re left with the app-level bits and whatever QUIC.cloud gives you (which has its own usage tiers). And it’s not the plugin to hand a nervous beginner: there are a lot of toggles, and it’s easy to break your layout if you go minify-happy without testing on staging first.
WP Fastest Cache: the simple all-rounder
WP Fastest Cache’s whole pitch is that it just works, anywhere. Apache, Nginx, LiteSpeed: doesn’t care. You install it, tick a handful of boxes, and you’re done.
The free version handles page caching, GZIP, browser caching, and HTML/CSS/JS minify-and-combine: the fundamentals, done cleanly. The one-off premium licence adds image optimisation, a mobile-specific cache, lazy loading, WebP and database cleanup.
Its ceiling is that it’s application-level caching. That’s perfectly good for most sites, but it can’t match server-level LSCache on a host that offers it.
Head to head
| LiteSpeed Cache | WP Fastest Cache | |
|---|---|---|
| Works on any host | ✗ best features need a LiteSpeed server | ✓ any host |
| Ease of setup | Moderate (many settings) | Very easy |
| Free feature depth | Huge (on LiteSpeed) | Basic essentials |
| Peak performance | Best-in-class (on LiteSpeed) | Good |
| Image optimisation | ✓ free | Premium only |
| Built-in CDN | ✓ QUIC.cloud (free tier) | ✗ bring your own |
| Best for | Sites on LiteSpeed hosting | Everyone else, and anyone who wants simple |
Our verdict
- On LiteSpeed hosting: LiteSpeed Cache, every time. It’s free and the server cache is in a different league. Don’t overthink it.
- Not on LiteSpeed: WP Fastest Cache for a no-fuss, reliable result. Don’t fight LiteSpeed Cache on a server it wasn’t built for; you’ll spend an hour to end up slower than the simple option.
Honest aside: when we’re not hosting a client on OpenLiteSpeed, or where Nginx server-level caching (FastCGI) alone doesn’t cut it, we tend to reach for WP Rocket. It’s paid, but it’s the most set-and-forget of the lot and it’s host-agnostic. If the budget’s tight, though, the two free options above cover most of what most sites need.
Before you install either
Whatever you land on, give it the same once-over you’d give any plugin. Is it actively maintained, widely used, properly supported? How to check if a WordPress plugin is safe walks through it, or run it through our free Plugin Risk Score tool in a couple of seconds. Both of these score well (millions of installs, active development), but it’s a habit worth keeping.
And remember caching is only half the speed story: the plugins already sitting on your site and your server setup matter just as much. A cache can’t rescue a site weighed down by ten years of half-used plugins.
Rather not think about any of this?
Fair enough, most people have a business to run. Working out what your host runs and keeping a WordPress site genuinely fast is our bread and butter: Prystine looks after WordPress sites, speed included. Have a chat if you’d like someone to just handle it.
Josh Cox
I'm Josh — I build, host and look after WordPress sites (and increasingly fast Astro / Next.js builds) for Oxfordshire businesses, from Didcot, since 2016. I also tinker with a few products of my own on the side.
