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Yoast SEO 27.1

Does Yoast SEO work with WordPress 6.9.1 and PHP 8.1.12? A smoke test was performed on .

Summary

Errors
1PHP deprecation warnings
2JavaScript exceptions
All test pages loaded successfully
No resource errors
Performance

Memory usage: 1.27 MiB
The average PHP memory usage increased by this amount after activating by the plugin.

Page speed impact: 0.300 seconds
The average page load time increased by this amount after activating the plugin.

Environment
WordPress version6.9.1
PHP version8.1.12
MySQL version10.6.10
PHP memory limit512M
Plugin Info
Last updated
Active installs 10,000,000+
WordPress.org page https://wordpress.org/plugins/wordpress-seo/
Badges

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Pages 17

‹ Test site — WordPress

Page screenshot: ‹ Test site — WordPress
URL /wp-admin/admin.php?page=wpseo_installation_successful_free
Requested URL /wp-admin/plugins.php?action=activate&plugin=wordpress-seo%2Fwp-seo.php&plugin_status=all&paged=1&s&_wpnonce=c23eb79f73
Aspect after-activation
HTTP status 200
Load time 2.853 s
Memory usage 4.92 MiB
JS errors None
Resource errors None

Tools → Yoast Redirects

Page screenshot: Tools → Yoast Redirects
URL /wp-admin/admin.php?page=wpseo_redirects&from_tools=1
Requested URL /wp-admin/tools.php?page=wpseo_redirects_tools
Aspect menu-item
HTTP status 200
Load time 0.542 s
Memory usage 4.85 MiB
JS errors None
Resource errors None

Yoast SEO

Page screenshot: Yoast SEO
URL /wp-admin/admin.php?page=wpseo_dashboard
Aspect menu-item
HTTP status 200
Load time 1.746 s
Memory usage 4.95 MiB
JS errors None
Resource errors None

Yoast SEO → Settings

Page screenshot: Yoast SEO → Settings
URL /wp-admin/admin.php?page=wpseo_page_settings
Aspect menu-item
HTTP status 200
Load time 0.761 s
Memory usage 5.01 MiB
JS errors None
Resource errors None

Yoast SEO → Integrations

Page screenshot: Yoast SEO → Integrations
URL /wp-admin/admin.php?page=wpseo_integrations
Aspect menu-item
HTTP status 200
Load time 0.894 s
Memory usage 4.88 MiB
JS errors None
Resource errors None

Yoast SEO → Tools

Page screenshot: Yoast SEO → Tools
URL /wp-admin/admin.php?page=wpseo_tools
Aspect menu-item
HTTP status 200
Load time 0.796 s
Memory usage 5.26 MiB
JS errors None
Resource errors None

Yoast SEO → Academy

Page screenshot: Yoast SEO → Academy
URL /wp-admin/admin.php?page=wpseo_page_academy
Aspect menu-item
HTTP status 200
Load time 0.673 s
Memory usage 4.86 MiB
JS errors None
Resource errors None

Yoast SEO → Plans

Page screenshot: Yoast SEO → Plans
URL /wp-admin/admin.php?page=wpseo_licenses
Aspect menu-item
HTTP status 200
Load time 0.416 s
Memory usage 4.83 MiB
JS errors None
Resource errors None

Yoast SEO → Workouts

Page screenshot: Yoast SEO → Workouts
URL /wp-admin/admin.php?page=wpseo_workouts
Aspect menu-item
HTTP status 200
Load time 0.729 s
Memory usage 4.9 MiB
JS errors None
Resource errors None

Yoast SEO → Redirects

Page screenshot: Yoast SEO → Redirects
URL /wp-admin/admin.php?page=wpseo_redirects
Aspect menu-item
HTTP status 200
Load time 0.442 s
Memory usage 4.83 MiB
JS errors None
Resource errors None

Yoast SEO → Support

Page screenshot: Yoast SEO → Support
URL /wp-admin/admin.php?page=wpseo_page_support
Aspect menu-item
HTTP status 200
Load time 0.427 s
Memory usage 4.83 MiB
JS errors None
Resource errors None

Yoast SEO → Upgrade

Page screenshot: Yoast SEO → Upgrade
URL https://yoast.com/reasons-to-upgrade/?days_active=0&navigation_page=main-menu&php_version=8.1&platform=wordpress&platform_version=6.9.1&screen=wpseo_upgrade_sidebar&shortlink=wordpress-menu-upgrade-premium&software=free&software_version=27.1&utm_campaign=evergreen&utm_content=upgrade-button&utm_medium=software&utm_source=yoast-seo-free&utm_term=upsell
Requested URL /wp-admin/admin.php?page=wpseo_upgrade_sidebar
Aspect menu-item
HTTP status 200
Load time 4.158 s
Memory usage N/A
JS errors 
[
    {
        "message": "ReferenceError: gtag is not defined\n    at <anonymous>:1:1\n    at https://www.googletagmanager.com/gtm.js?id=GTM-NHRB36F:982:429\n    at lR (https://www.googletagmanager.com/gtm.js?id=GTM-NHRB36F:984:31)\n    at Pd.kR (https://www.googletagmanager.com/gtm.js?id=GTM-NHRB36F:981:92)\n    at Pd.<anonymous> (https://www.googletagmanager.com/gtm.js?id=GTM-NHRB36F:408:187)\n    at Qd.k.apply (https://www.googletagmanager.com/gtm.js?id=GTM-NHRB36F:335:466)\n    at lb (https://www.googletagmanager.com/gtm.js?id=GTM-NHRB36F:297:209)\n    at kb (https://www.googletagmanager.com/gtm.js?id=GTM-NHRB36F:296:527)\n    at Pd.<anonymous> (https://www.googletagmanager.com/gtm.js?id=GTM-NHRB36F:359:473)\n    at Qd.k.apply (https://www.googletagmanager.com/gtm.js?id=GTM-NHRB36F:335:466)",
        "trace": null,
        "code": null
    }
]
Resource errors None

Yoast SEO → AI Brand Insights

Page screenshot: Yoast SEO → AI Brand Insights
URL https://yoast.com/product/yoast-seo-ai-plus/?utm_source=yoast-seo-free&utm_campaign=evergreen&utm_term=upsell&utm_content=brand-insights-wp-admin&navigation_page=main-menu&php_version=8.1&platform=wordpress&platform_version=6.9.1&software=free&software_version=27.1&days_active=0&screen=wpseo_brand_insights&shortlink=brand-insights-wp-admin
Requested URL /wp-admin/admin.php?page=wpseo_brand_insights
Aspect menu-item
HTTP status 200
Load time 5.169 s
Memory usage N/A
JS errors 
[
    {
        "message": "ReferenceError: gtag is not defined\n    at <anonymous>:1:1\n    at https://www.googletagmanager.com/gtm.js?id=GTM-NHRB36F:982:429\n    at lR (https://www.googletagmanager.com/gtm.js?id=GTM-NHRB36F:984:31)\n    at https://www.googletagmanager.com/gtm.js?id=GTM-NHRB36F:984:63",
        "trace": null,
        "code": null
    }
]
Resource errors None

Test site - Just another WordPress site

Page screenshot: Test site - Just another WordPress site
URL /
Aspect front-page
HTTP status 200
Load time 0.834 s
Memory usage 5.3 MiB
JS errors None
Resource errors None

Dashboard ‹ Test site — WordPress

Page screenshot: Dashboard ‹ Test site — WordPress
URL /wp-admin/index.php
Aspect new-meta-boxes
HTTP status 200
Load time 0.586 s
Memory usage 4.96 MiB
JS errors None
Resource errors None

Add Post ‹ Test site — WordPress

Page screenshot: Add Post ‹ Test site — WordPress
URL /wp-admin/post-new.php
Aspect new-meta-boxes
HTTP status 200
Load time 1.386 s
Memory usage 8.08 MiB
JS errors None
Resource errors None

Add Page ‹ Test site — WordPress

Page screenshot: Add Page ‹ Test site — WordPress
URL /wp-admin/post-new.php?post_type=page
Aspect new-meta-boxes
HTTP status 200
Load time 1.134 s
Memory usage 8.06 MiB
JS errors None
Resource errors None

Benchmark

URL Load time Memory usage
Inactive Active Change Inactive Active Change
/wp-admin/index.php0.542 s1.268 s+0.726 s3.78 MiB4.96 MiB+ 1.18 MiB
/wp-admin/edit.php0.406 s0.511 s+0.105 s3.78 MiB5.16 MiB+ 1.38 MiB
/wp-admin/post-new.php0.866 s1.925 s+1.059 s6.31 MiB8.15 MiB+ 1.84 MiB
/wp-admin/upload.php0.509 s1.138 s+0.629 s3.74 MiB4.87 MiB+ 1.13 MiB
/wp-admin/options-writing.php0.368 s0.436 s+0.068 s3.71 MiB4.83 MiB+ 1.12 MiB
/wp-admin/media-new.php0.539 s0.371 s-0.168 s3.7 MiB4.82 MiB+ 1.12 MiB
/wp-admin/edit-tags.php?taxonomy=category0.365 s0.705 s+0.340 s3.72 MiB4.85 MiB+ 1.14 MiB
/wp-admin/post-new.php?post_type=page0.766 s1.280 s+0.514 s6.3 MiB8.06 MiB+ 1.76 MiB
/wp-admin/options-discussion.php0.393 s0.471 s+0.078 s3.71 MiB4.84 MiB+ 1.12 MiB
/wp-admin/edit-comments.php0.375 s0.423 s+0.048 s3.73 MiB4.87 MiB+ 1.14 MiB
/0.317 s0.220 s-0.097 s4.11 MiB5.11 MiB+ 1 MiB
Average 0.495 s0.795 s+0.300 s4.24 MiB5.5 MiB+ 1.27 MiB

Code Statistics

Note: Third-party libraries and minified JS/CSS files are excluded from these statistics where possible, so the numbers you see here may be lower than those reported by other tools.

PHP
Language % Lines of code Comment lines Files
PHP99.0%78,35169,4721,359
SVG0.6%457180
JSON0.2%14903
XSLT0.2%14501
XML0.1%4401
Markdown0.0%2401
Total 79,170 69,473 1,445

PHP Code Analysis | More results »

Lines of code 66,749
Total complexity 13,019
Median class complexity 5.0
Median method complexity 1.0
Most complex class Yoast\WP\SEO\Generated\Cached_Container
Most complex function WPSEO_Option_Titles::validate_option()
Classes 1,055
Methods 5,917
Functions 51

Additions

Things that the plugin adds to the site. This section is not intended to be comprehensive. The test tool only looks for a few specific types of added content.

Database Tables 5

Options wp_options 6

User Metadata wp_usermeta 3

Meta Boxes 

{
    "dashboard": {
        "wpseo-dashboard-overview": {
            "title": "Yoast SEO Posts Overview",
            "context": "normal"
        },
        "wpseo-wincher-dashboard-overview": {
            "title": "Yoast SEO / Wincher: Top Keyphrases",
            "context": "normal"
        }
    },
    "post": {
        "wpseo_meta": {
            "title": "Yoast SEO",
            "context": "normal"
        }
    },
    "page": {
        "wpseo_meta": {
            "title": "Yoast SEO",
            "context": "normal"
        }
    }
}

Roles 2

ID Name
wpseo_managerSEO Manager
wpseo_editorSEO Editor

Capabilities 4

PHP Error Log 1 lines

[03-Mar-2026 10:07:12 UTC] PHP Deprecated:  strip_tags(): Passing null to parameter #1 ($string) of type string is deprecated in /wp-admin/admin-header.php on line 41
See also: All tests for this plugin, How to Hide Yoast SEO Admin Menus and More