How Much Does LiteSpeed Cache Slow Down WordPress? We Measured It
LiteSpeed Cache is a WordPress plugin used on 7M+ sites. All-in-one unbeatable acceleration & PageSpeed improvement: caching, image/CSS/JS optimization. Our 3-context benchmark shows it barely registers (-6ms TTFB on activation).
How is this scored?
Our Benchmark Methodology
Every speed score on MakeWPFast is based on real performance measurements, not estimates. We install each plugin on a clean WordPress 6.9 setup (PHP 8.3, MariaDB, GeneratePress theme) and measure two key metrics:
PHP Memory Usage — how much additional memory the plugin consumes per request. Each doubling of memory overhead costs 10 points. High memory usage can cause crashes on shared hosting and limits how many plugins you can safely run together.
Database Queries — how many extra SQL queries the plugin runs per page load. Each 10x increase in query overhead costs 25 points. More queries mean more database work, slower pages, and harder scaling.
The score uses a logarithmic scale — the first few extra queries or megabytes matter more than going from 100 to 110 queries. This reflects real-world impact: the jump from 4 to 14 queries is far more noticeable than 100 to 110.
| Grade | Score | What it means |
|---|---|---|
| A | 90–100 | Negligible impact. Safe to install on any hosting. |
| A- | 80–89 | Very light impact. Minimal overhead on any setup. |
| B+ / B / B- | 65–79 | Light impact. Adds some overhead but manageable on most setups. |
| C+ / C / C- | 50–64 | Moderate impact. May noticeably slow down budget hosting. |
| D+ / D | 35–49 | Heavy impact. Will affect page load times. Consider alternatives. |
| F | 0–34 | Severe impact. Significant resource usage that hurts performance. |
Plugins marked "Not Yet Tested" have not been benchmarked yet. We do not estimate or guess scores — if there is no measured data, there is no grade.
Note: Benchmarks measure a plugin in isolation on a clean install. Real-world impact varies based on your hosting, other plugins, and how the plugin is configured.
| Context | TTFB | Memory | Queries |
|---|---|---|---|
| Activation | +-6 ms | +0 MB | +1 |
| Homepage | +19 ms | +2 MB | +3 |
| WP Admin | +0 ms | +2 MB | +7 |
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Performance Analysis
LiteSpeed Cache is a complete caching and optimization solution for WordPress that handles page caching, image, CSS and JS minification to boost load times and PageSpeed metrics.
It’s aimed at developers who want a single plugin to handle all performance tasks, especially those using LiteSpeed servers where the plugin is tightly integrated.
It’s a solid choice if you’re comfortable with server‑specific caching and don’t mind a modest memory bump and a negligible TTFB impact. Skip it if you’re on PHP‑based hosting, need a lightweight solution, or want to avoid server‑specific features.
Maintenance Status
Last updated: 2025-12-16. Requires PHP 7.2+. Trusted by 7.0M+ active installations.
Benchmark data measured in an isolated Docker environment (WordPress 6.8, PHP 8.3, GeneratePress). See our full methodology.
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Alternatives to LiteSpeed Cache
| Plugin | Speed Score | Active Installs |
|---|---|---|
| Site Kit by Google | B- | 5M+ |
| Jetpack | B | 3M+ |
| WP Super Cache | A | 1M+ |
Frequently Asked Questions
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