WordPress homepage Core Web Vitals by detectable plugin count (Sept 2026, homepages with CrUX data)
| Plugins | CWV pass | LCP pass | INP pass | CLS pass | Median JS | Sites |
|---|---|---|---|---|---|---|
| 0 to 2 | 57.9% | 72.3% | 85.6% | 84.2% | 633 KB | 42,529 |
| 3 to 5 | 45.9% | 58.5% | 81.5% | 82.8% | 825 KB | 45,486 |
| 6 to 8 | 30.8% | 40.2% | 75.2% | 81.4% | 1,169 KB | 10,785 |
| 9+ | 24.0% | 32.2% | 67.7% | 79.8% | 1,317 KB | 1,311 |
Source: PageSpeed Matters, Sept 2026. Plugins detectable from the homepage; WooCommerce counts as one.
Summary
"Too many plugins" is the most common explanation for a slow WordPress site. We wanted to see whether the data backs it up, so we compared the number of plugins detectable on WordPress homepages with how often those homepages pass Core Web Vitals.
The pattern is clear. Top 1M WordPress homepages with 0 to 2 detectable plugins pass Core Web Vitals 57.9% of the time, against 24.0% for those with 9 or more. This is a correlation, not proof that each plugin slows a site, but the curve holds for stores, non-stores and the most popular sites alike.
What we measured
We used the HTTP Archive crawl of September 2026 (mobile, top 1M sites by Chrome traffic) and counted the plugins detectable on each WordPress homepage. WooCommerce itself counts as one plugin. Plugins that leave no trace on the homepage are not counted, so real plugin counts are higher than these.
We matched each homepage to its Chrome UX Report field data and recorded whether it passes LCP, INP and CLS at the 75th percentile. A homepage passes Core Web Vitals when all three are good. We also recorded median JavaScript weight and request counts from the crawl.
The main limit is that this is a correlation. Bigger, busier sites tend to run more plugins and have heavier pages anyway, so plugin count is partly a stand-in for how complex a site is.
Pass rates fall as plugin counts rise
Among top 1M WordPress homepages with CrUX data, the Core Web Vitals pass rate is 57.9% with 0 to 2 detectable plugins (42,529 sites). It falls to 45.9% with 3 to 5 (45,486), 30.8% with 6 to 8 (10,785) and 24.0% with 9 or more (1,311).
Most sites sit in the first two groups. Only 1,311 homepages with CrUX data show 9 or more detectable plugins, but their pass rate is less than half that of the leanest group.
24.0%
Core Web Vitals pass rate for top 1M WordPress homepages with 9 or more detectable plugins (1,311 sites with CrUX data).
The pattern holds for stores, non-stores and popular sites
WooCommerce stores follow the same curve, from 53.8% at 0 to 2 plugins to 39.3% at 3 to 5, 28.7% at 6 to 8 and 20.9% at 9 or more. Stores start a little lower and step down the same way.
The decline is not only a store effect. WordPress sites without WooCommerce pass 58.0% at 0 to 2 plugins and 31.6% at 9 or more (377 sites).
It also holds among the most popular sites. Top 100K WordPress homepages pass 63.9% of the time with 0 to 2 plugins (4,077 with CrUX), 55.6% with 3 to 5 (2,418) and 35.8% with 6 to 8 (232). Popular sites usually have more engineering help, yet the same pattern shows up.
LCP drives the drop
Of the three metrics, loading speed moves most. The LCP pass rate falls from 72.3% at 0 to 2 plugins to 32.2% at 9 or more. INP pass falls from 85.6% to 67.7%, and CLS pass only slips from 84.2% to 79.8%.
That fits how plugins usually work. Many add their own scripts and stylesheets to every page, and that extra code can delay the main content. Layout shift is less tied to plugin count, likely because it depends more on the theme and how images and ads are sized.
Pages get heavier as plugins pile up
Median JavaScript is 633 KB at 0 to 2 plugins, 825 KB at 3 to 5, 1,169 KB at 6 to 8 and 1,317 KB at 9 or more. Median requests rise from 80 to 178 across the same groups.
More code and more requests give the browser more to download and run on every visit, especially on mobile. That is the likely link between plugin count and the falling LCP and INP pass rates, though some of the weight will come from the themes, builders and tracking tags that busier sites also tend to run.
What this means for your site
The goal is not a magic plugin number. It is to make sure every plugin earns its place.
- List your active plugins and remove any you no longer use. Deactivated plugins should be deleted too.
- Check which plugins load scripts and styles on every page. Many only need to run on one page, such as a contact form or a store page.
- Replace several small plugins with one that does the same jobs, where that is practical.
- Test LCP before and after adding a plugin, using field data where you have it, so you can see its cost.
- Keep every plugin updated, since an unmaintained plugin is both a speed and a security risk.
Sources
- HTTP Archive crawl of the top 1M sites by Chrome traffic, September 2026, mobile
- Chrome UX Report field data, 75th percentile LCP, INP and CLS, September 2026
- web.dev, Web Vitals: https://web.dev/articles/vitals
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<p style="font:14px/1.5 system-ui,sans-serif">Source: <a href="https://www.pagespeedmatters.com/resources/data-studies/wordpress-plugin-count-vs-speed">WordPress Plugin Count vs Speed: 9+ Plugins Pass 24% - PageSpeed Matters</a></p>
Frequently asked questions
Do more plugins slow down WordPress?
Sites with more plugins tend to be slower. Top 1M WordPress homepages with 0 to 2 detectable plugins pass Core Web Vitals 57.9% of the time, against 24.0% for those with 9 or more. It is a correlation, since bigger sites also run more plugins.
How many plugins is too many for WordPress?
There is no fixed number, but pass rates fall at each step: 57.9% at 0 to 2 detectable plugins, 45.9% at 3 to 5, 30.8% at 6 to 8 and 24.0% at 9 or more.
Which Core Web Vital do plugins affect most?
LCP. Its pass rate falls from 72.3% at 0 to 2 plugins to 32.2% at 9 or more, while INP falls from 85.6% to 67.7% and CLS only slips from 84.2% to 79.8%.
A plugin audit is one of the simplest maintenance jobs on a WordPress site, and trimming code that loads on every page helps both speed and security. Need help with this? See our WordPress support services.