WP REST Cache 2026.1.2
Does WP REST Cache work with WordPress 6.9.1 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: 147.13 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 | 6.9.1 |
|---|---|
| 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=bfdd4b6ce2 |
| Aspect | after-activation |
| HTTP status | 200 |
| Load time | 0.394 s |
| Memory usage | 3.93 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 | 0.314 s |
| Memory usage | 3.88 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 | 0.271 s |
| Memory usage | 3.85 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 | 0.264 s |
| Memory usage | 3.86 MiB |
| JS errors | None |
| Resource errors | None |
Test site – Just another WordPress site
| URL | / |
|---|---|
| Aspect | front-page |
| HTTP status | 200 |
| Load time | 0.188 s |
| Memory usage | 4.2 MiB |
| JS errors | None |
| Resource errors | None |
Benchmark
| URL | Load time | Memory usage | ||||
|---|---|---|---|---|---|---|
| Inactive | Active | Change | Inactive | Active | Change | |
| /wp-admin/index.php | 0.403 s | 0.544 s | +0.141 s | 3.78 MiB | 3.92 MiB | + 150.68 KiB |
| /wp-admin/edit.php | 0.348 s | 0.355 s | +0.007 s | 3.78 MiB | 3.98 MiB | + 199.25 KiB |
| /wp-admin/post-new.php | 0.829 s | 0.849 s | +0.020 s | 6.31 MiB | 6.52 MiB | + 219.47 KiB |
| /wp-admin/upload.php | 0.675 s | 0.425 s | -0.250 s | 3.74 MiB | 3.86 MiB | + 127.44 KiB |
| /wp-admin/options-writing.php | 0.313 s | 0.290 s | -0.023 s | 3.71 MiB | 3.84 MiB | + 131.43 KiB |
| /wp-admin/media-new.php | 0.503 s | 0.473 s | -0.030 s | 3.7 MiB | 3.84 MiB | + 139.63 KiB |
| /wp-admin/edit-tags.php?taxonomy=category | 0.310 s | 0.288 s | -0.022 s | 3.72 MiB | 3.86 MiB | + 150.3 KiB |
| /wp-admin/post-new.php?post_type=page | 0.813 s | 0.675 s | -0.138 s | 6.3 MiB | 6.44 MiB | + 144.75 KiB |
| /wp-admin/options-discussion.php | 0.334 s | 0.309 s | -0.025 s | 3.72 MiB | 3.84 MiB | + 127.43 KiB |
| /wp-admin/edit-comments.php | 0.330 s | 0.329 s | -0.001 s | 3.74 MiB | 3.86 MiB | + 127.42 KiB |
| / | 0.271 s | 0.183 s | -0.088 s | 4.11 MiB | 4.21 MiB | + 100.59 KiB |
| Average | 0.466 s | 0.429 s | -0.037 s | 4.24 MiB | 4.38 MiB | + 147.13 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 | 92.4% | 2,516 | 1,912 | 26 | |
| Markdown | 7.5% | 203 | 0 | 1 | |
| CSS | 0.1% | 4 | 0 | 1 | |
| Total | 2,723 | 1,912 | 28 | ||
PHP Code Analysis | More results »
| Lines of code | 2,047 |
|---|---|
| Total complexity | 470 |
| 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\API\Endpoint_Api::skip_caching() |
| Classes | 16 |
|---|---|
| Methods | 138 |
| 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
[25-Feb-2026 15:56:31 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
[25-Feb-2026 15:56:31 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
[25-Feb-2026 15:56:32 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
[25-Feb-2026 15:56:32 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
[25-Feb-2026 15:56:33 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
[25-Feb-2026 15:56:34 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
[25-Feb-2026 15:56:36 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
[25-Feb-2026 15:56:37 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
[25-Feb-2026 15:56:37 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
[25-Feb-2026 15:56:37 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
[25-Feb-2026 15:56:40 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
[25-Feb-2026 15:56:40 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
[25-Feb-2026 15:56:40 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
[25-Feb-2026 15:56:40 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
[25-Feb-2026 15:56:41 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
[25-Feb-2026 15:56:41 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
[25-Feb-2026 15:56:41 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
[25-Feb-2026 15:56:43 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
[25-Feb-2026 15:56:43 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
[25-Feb-2026 15:56:44 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
[25-Feb-2026 15:56:44 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
[25-Feb-2026 15:56:45 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
[25-Feb-2026 15:56:45 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