WP REST Cache 2025.1.8
Does WP REST Cache work with WordPress 6.9 and PHP 8.1.12? A smoke test was performed on .
Summary
Errors
| 23 | PHP warnings |
| 4 | PHP deprecation warnings |
| No JavaScript exceptions | |
| All test pages loaded successfully | |
| No resource errors |
Performance
Memory usage: 127.07 KiB
The average PHP memory usage increased by this amount after activating by the plugin.
Page speed impact:
insignificant.
The plugin didn't make the site noticeably slower.
Environment
| WordPress version | 6.9 |
|---|---|
| PHP version | 8.1.12 |
| MySQL version | 10.6.10 |
| PHP memory limit | 512M |
Plugin Info
| Last updated | |
|---|---|
| Active installs | 10,000+ |
| WordPress.org page | https://wordpress.org/plugins/wp-rest-cache/ |
| Badges |
|
Pages 5
Plugins ‹ Test site — WordPress
| URL | /wp-admin/plugins.php?plugin_status=all&paged=1&s |
|---|---|
| Requested URL | /wp-admin/plugins.php?action=activate&plugin=wp-rest-cache%2Fwp-rest-cache.php&plugin_status=all&paged=1&s&_wpnonce=5e53b6cd5a |
| Aspect | after-activation |
| HTTP status | 200 |
| Load time | 0.404 s |
| Memory usage | 3.92 MiB |
| JS errors | None |
| Resource errors | None |
Settings → WP REST Cache
| URL | /wp-admin/options-general.php?page=wp-rest-cache |
|---|---|
| Aspect | menu-item |
| HTTP status | 200 |
| Load time | 0.293 s |
| Memory usage | 3.86 MiB |
| JS errors | None |
| Resource errors | None |
Settings → WP REST Cache → Endpoint API Caches
| URL | /wp-admin/options-general.php?page=wp-rest-cache&sub=endpoint-api |
|---|---|
| Aspect | menu-item-tab |
| HTTP status | 200 |
| Load time | 0.273 s |
| Memory usage | 3.83 MiB |
| JS errors | None |
| Resource errors | None |
Settings → WP REST Cache → Clear Caches
| URL | /wp-admin/options-general.php?page=wp-rest-cache&sub=clear-cache |
|---|---|
| Aspect | menu-item-tab |
| HTTP status | 200 |
| Load time | 0.286 s |
| Memory usage | 3.83 MiB |
| JS errors | None |
| Resource errors | None |
Test site – Just another WordPress site
| URL | / |
|---|---|
| Aspect | front-page |
| HTTP status | 200 |
| Load time | 0.189 s |
| Memory usage | 4.19 MiB |
| JS errors | None |
| Resource errors | None |
Benchmark
| URL | Load time | Memory usage | ||||
|---|---|---|---|---|---|---|
| Inactive | Active | Change | Inactive | Active | Change | |
| /wp-admin/index.php | 0.424 s | 0.360 s | -0.064 s | 3.77 MiB | 3.9 MiB | + 130.25 KiB |
| /wp-admin/edit.php | 0.363 s | 0.726 s | +0.363 s | 3.78 MiB | 3.95 MiB | + 178.82 KiB |
| /wp-admin/post-new.php | 0.882 s | 0.942 s | +0.060 s | 6.3 MiB | 6.49 MiB | + 192.16 KiB |
| /wp-admin/upload.php | 0.631 s | 0.403 s | -0.228 s | 3.74 MiB | 3.84 MiB | + 106.96 KiB |
| /wp-admin/options-writing.php | 0.360 s | 0.302 s | -0.058 s | 3.71 MiB | 3.82 MiB | + 110.95 KiB |
| /wp-admin/media-new.php | 0.498 s | 0.342 s | -0.156 s | 3.7 MiB | 3.82 MiB | + 119.15 KiB |
| /wp-admin/edit-tags.php?taxonomy=category | 0.386 s | 0.315 s | -0.071 s | 3.71 MiB | 3.84 MiB | + 129.82 KiB |
| /wp-admin/post-new.php?post_type=page | 0.697 s | 0.739 s | +0.042 s | 6.3 MiB | 6.41 MiB | + 119.85 KiB |
| /wp-admin/options-discussion.php | 0.336 s | 0.360 s | +0.024 s | 3.71 MiB | 3.82 MiB | + 107.51 KiB |
| /wp-admin/edit-comments.php | 0.356 s | 0.336 s | -0.020 s | 3.73 MiB | 3.84 MiB | + 107.01 KiB |
| / | 0.282 s | 0.204 s | -0.078 s | 4.1 MiB | 4.19 MiB | + 95.27 KiB |
| Average | 0.474 s | 0.457 s | -0.017 s | 4.23 MiB | 4.36 MiB | + 127.07 KiB |
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.
| Language | % | Lines of code | Comment lines | Files | |
|---|---|---|---|---|---|
| PHP | 92.9% | 2,343 | 1,733 | 26 | |
| Markdown | 6.9% | 174 | 0 | 1 | |
| CSS | 0.2% | 4 | 0 | 1 | |
| Total | 2,521 | 1,733 | 28 | ||
PHP Code Analysis | More results »
| Lines of code | 1,877 |
|---|---|
| Total complexity | 438 |
| Median class complexity | 7.5 |
| Median method complexity | 3.0 |
| Most complex class | WP_Rest_Cache_Plugin\Includes\Caching\Caching |
| Most complex function | WP_Rest_Cache_Plugin\Includes\Caching\Caching::process_recursive_cache_relations() |
| Classes | 16 |
|---|---|
| Methods | 126 |
| Functions | 0 |
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 2
- wp_wrc_caches
- wp_wrc_relations
Options wp_options 8
- wp_rest_cache_allowed_endpoints
- wp_rest_cache_allowed_request_methods
- wp_rest_cache_cacheable_request_headers
- wp_rest_cache_database_version
- wp_rest_cache_disallowed_endpoints
- wp_rest_cache_item_allowed_endpoints
- wp_rest_cache_rest_prefix
- wp_rest_cache_uncached_parameters
PHP Error Log 27 lines
[03-Dec-2025 17:03:10 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309
[03-Dec-2025 17:03:10 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309
[03-Dec-2025 17:03:11 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309
[03-Dec-2025 17:03:11 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309
[03-Dec-2025 17:03:12 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309
[03-Dec-2025 17:03:13 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309
[03-Dec-2025 17:03:14 UTC] PHP Deprecated: Function WP_Dependencies->add_data() was called with an argument that is <strong>deprecated</strong> since version 6.9.0! IE conditional comments are ignored by all supported browsers. in /wp-includes/functions.php on line 6131
[03-Dec-2025 17:03:14 UTC] PHP Deprecated: Function WP_Dependencies->add_data() was called with an argument that is <strong>deprecated</strong> since version 6.9.0! IE conditional comments are ignored by all supported browsers. in /wp-includes/functions.php on line 6131
[03-Dec-2025 17:03:15 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309
[03-Dec-2025 17:03:15 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309
[03-Dec-2025 17:03:16 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309
[03-Dec-2025 17:03:16 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309
[03-Dec-2025 17:03:19 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309
[03-Dec-2025 17:03:19 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309
[03-Dec-2025 17:03:19 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309
[03-Dec-2025 17:03:19 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309
[03-Dec-2025 17:03:20 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309
[03-Dec-2025 17:03:20 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309
[03-Dec-2025 17:03:20 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309
[03-Dec-2025 17:03:23 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309
[03-Dec-2025 17:03:23 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309
[03-Dec-2025 17:03:23 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309
[03-Dec-2025 17:03:23 UTC] PHP Deprecated: Function WP_Dependencies->add_data() was called with an argument that is <strong>deprecated</strong> since version 6.9.0! IE conditional comments are ignored by all supported browsers. in /wp-includes/functions.php on line 6131
[03-Dec-2025 17:03:23 UTC] PHP Deprecated: Function WP_Dependencies->add_data() was called with an argument that is <strong>deprecated</strong> since version 6.9.0! IE conditional comments are ignored by all supported browsers. in /wp-includes/functions.php on line 6131
[03-Dec-2025 17:03:24 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309
[03-Dec-2025 17:03:24 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309
[03-Dec-2025 17:03:25 UTC] PHP Warning: copy(/wp-content/mu-plugins/wp-rest-cache.php): Failed to open stream: Permission denied in /wp-admin/includes/class-wp-filesystem-direct.php on line 309