How Advanced Custom Fields (ACF®) Affects Your WordPress Speed
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 the difference in three metrics:
TTFB (Time To First Byte) — how many milliseconds the plugin adds to server response time. This is the most important factor (50% of the score) because it directly affects every page load.
Memory usage — how much additional PHP memory the plugin consumes per request (30% of score). High memory usage can cause crashes on shared hosting.
Database queries — how many extra SQL queries the plugin runs per page load (20% of score). More queries mean more database work on every request.
| Grade | What it means |
|---|---|
| A / A- | Negligible impact. Safe to install on any hosting. |
| B+ / B / B- | Light impact. Adds some overhead but manageable on most setups. |
| C+ / C / C- | Moderate impact. May noticeably slow down budget hosting. |
| D+ / D | Heavy impact. Will affect page load times. Consider alternatives. |
| F | 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.
Share This Badge
Add this performance badge to your site or README:
Performance Analysis
ACF is a developer plugin that lets you create custom fields and repeater fields for WordPress sites. It’s aimed at developers building front-end customization rather than non‑technical users.
Installing ACF adds a small overhead: it nudges TTFB up by about 2ms, uses roughly 2 MB extra memory, and generates three extra queries per page load. That’s noticeable if you’re already pushing the limits of your host or using a low‑end server.
For a typical development project that only adds a handful of fields, the cost is acceptable. If you need zero‑impact plugins or you’re running a high‑traffic site with tight memory or query budgets, you should look for alternatives or disable ACF.
Maintenance Status
Last updated: 2025-12-03. Requires PHP 7.4+. Trusted by 2.0M+ active installations.
Benchmark data measured in an isolated Docker environment (WordPress 6.8, PHP 8.3, GeneratePress). See our full methodology.
Find slow plugins on your own site
WP Multitool scans your WordPress site for slow queries, memory hogs, and performance bottlenecks - in one click.
Alternatives to Advanced Custom Fields (ACF®)
| Plugin | Speed Score | Active Installs |
|---|---|---|
| Kirki Customizer Framework | A | 500K+ |
| WooCommerce Legacy REST API | A | 400K+ |
| Post Duplicator | A | 200K+ |
Frequently Asked Questions
Does Advanced Custom Fields (ACFu00ae) slow down WordPress?
Is Advanced Custom Fields (ACFu00ae) still maintained?
What are the best alternatives to Advanced Custom Fields (ACFu00ae)?
Plugin reviews, speed optimization guides, and error debugging — straight to your inbox.
No spam. Unsubscribe anytime. We respect your privacy.