WP REST Cache 2026.1.0
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 |
| No JavaScript exceptions | |
| All test pages loaded successfully | |
| No resource errors |
Performance
Memory usage: 130.74 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=e5f4d6d2f5 |
| Aspect | after-activation |
| HTTP status | 200 |
| Load time | 0.415 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 | 0.276 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 | 0.295 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 | 0.198 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 | 0.437 s | 0.374 s | -0.063 s | 3.77 MiB | 3.9 MiB | + 133.5 KiB |
| /wp-admin/edit.php | 0.355 s | 0.353 s | -0.002 s | 3.78 MiB | 3.96 MiB | + 182.07 KiB |
| /wp-admin/post-new.php | 0.871 s | 0.905 s | +0.034 s | 6.3 MiB | 6.49 MiB | + 195.4 KiB |
| /wp-admin/upload.php | 0.677 s | 0.421 s | -0.256 s | 3.74 MiB | 3.84 MiB | + 110.27 KiB |
| /wp-admin/options-writing.php | 0.316 s | 0.291 s | -0.025 s | 3.71 MiB | 3.82 MiB | + 114.26 KiB |
| /wp-admin/media-new.php | 0.502 s | 0.328 s | -0.174 s | 3.7 MiB | 3.82 MiB | + 122.45 KiB |
| /wp-admin/edit-tags.php?taxonomy=category | 0.457 s | 0.298 s | -0.159 s | 3.71 MiB | 3.84 MiB | + 133.13 KiB |
| /wp-admin/post-new.php?post_type=page | 0.708 s | 0.712 s | +0.004 s | 6.29 MiB | 6.42 MiB | + 127.58 KiB |
| /wp-admin/options-discussion.php | 0.327 s | 0.385 s | +0.058 s | 3.71 MiB | 3.82 MiB | + 110.76 KiB |
| /wp-admin/edit-comments.php | 0.351 s | 0.318 s | -0.033 s | 3.73 MiB | 3.84 MiB | + 110.25 KiB |
| / | 0.296 s | 0.172 s | -0.124 s | 4.1 MiB | 4.19 MiB | + 98.52 KiB |
| Average | 0.482 s | 0.414 s | -0.067 s | 4.23 MiB | 4.36 MiB | + 130.74 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 | 92.0% | 2,368 | 1,821 | 26 | |
| Markdown | 7.9% | 203 | 0 | 1 | |
| CSS | 0.2% | 4 | 0 | 1 | |
| Total | 2,575 | 1,821 | 28 | ||
PHP Code Analysis | More results »
| Lines of code | 1,902 |
|---|---|
| Total complexity | 444 |
| Median class complexity | 7.5 |
| Median method complexity | 2.0 |
| 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 | 131 |
| 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 23 lines
[27-Jan-2026 01:28:51 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
[27-Jan-2026 01:28:51 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
[27-Jan-2026 01:28:52 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
[27-Jan-2026 01:28:53 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
[27-Jan-2026 01:28:54 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
[27-Jan-2026 01:28:55 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
[27-Jan-2026 01:28:57 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
[27-Jan-2026 01:28:57 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
[27-Jan-2026 01:28:58 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
[27-Jan-2026 01:28:58 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
[27-Jan-2026 01:29:00 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
[27-Jan-2026 01:29:00 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
[27-Jan-2026 01:29:00 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
[27-Jan-2026 01:29:01 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
[27-Jan-2026 01:29:01 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
[27-Jan-2026 01:29:02 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
[27-Jan-2026 01:29:02 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
[27-Jan-2026 01:29:04 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
[27-Jan-2026 01:29:04 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
[27-Jan-2026 01:29:05 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
[27-Jan-2026 01:29:05 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
[27-Jan-2026 01:29:06 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
[27-Jan-2026 01:29:06 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