{"active_installs":300000,"added":{"timestamp":1415923200,"timezone":"UTC"},"author":"Till Krüss","author_profile":{"url":"https://profiles.wordpress.org/tillkruess/","alt":"Till Krüss"},"banners":[{"type":"high","url":"https://ps.w.org/redis-cache/assets/banner-1544x500.png?rev=2315420"},{"type":"low","url":"https://ps.w.org/redis-cache/assets/banner-772x250.png?rev=2315420"}],"changelog":"

2.7.0

Preserve key TTL when calling (in|de)crement methods
Updated wp_cache_*() function signatures to match core
Removed deprecated HHVM support
Removed deprecated WP_REDIS_SERIALIZER constant

2.6.5

Fixed an issue with (in|de)crement cache values when using igbinary

2.6.4

Prevent some deprecation notices
Fixed an issue with (in|de)crement cache values

2.6.3

Switch to E_USER_DEPRECATED instead of _doing_it_wrong() in drop-in
Fixed error when using Credis (deprecated) as client

2.6.2

Fixed more PHP 7.2 heredoc parsing errors

2.6.1

Fixed PHP 7.2 heredoc parsing error
Fixed call to undefined function wp_rand()

2.6.0

Added Primary Branch header
Added id to script/style tags
Upgraded Predis to v2.4.0
Upgraded Credis to v1.17.0
Mark as tested up to 6.8
Adhere to Plugin Check (PCP)
Fixed (in|de)crement not working with serializer
Fixed rare replication mode issue
Fixed rare fatal error in diganostics

2.5.4

Respect WP_REDIS_SCHEME for Cluster connections
Fixed issue with Predis and SentinelReplication connection
Fixed double-slash in admin.css URL

2.5.3

Added WP_REDIS_DISABLE_GROUP_FLUSH constant
Added redis_cache_manager_capability filter and WP_REDIS_MANAGER_CAPABILITY constant
Added WP_REDIS_SSL_CONTEXT support for PhpRedis cluster connections
Fixed several issues with Predis and cluster/replicated connection
Fixed another rare fatal error in show_error_and_die()

2.5.2

Respect WP_REDIS_FLUSH_TIMEOUT in Lua flush scripts
Improve DISALLOW_FILE_MODS support
Reverted behavioral change to sanitize_key_part()
Fixed rare fatal error in show_error_and_die() (again)

2.5.1

Added timeouts to diagnostics
Support rare PHP installations without sockets extension
Fixed rare fatal error in show_error_and_die()
Fixed deprecation notice warning in sanitize_key_part()

2.5.0

Require WordPress 4.6 or newer
Load text-domain only when needed
Added WP_REDIS_DISABLE_DROPIN_CHECK constant
Respect file_mod_allowed filter and DISALLOW_FILE_MODS constant
Renamed .redis-write-test.tmp test file to object-cache.tmp
Call redis_object_cache_error action before wp_die()
Allow WP_REDIS_PLUGIN_PATH to be defined elsewhere
Added experimental flush timeout (defaults to 5 seconds)
Dropped unnecessary default ignored groups

2.4.4

Improved handling of unexpected transaction results

2.4.3

Fixed PHP <=7.2 syntax error
Fixed loading error-page translations

2.4.2

Made admin-bar script more robust
Improved recovery instructions on redis-error.php
Improved CloudLinux detection
Localization improvements
Prevent W3 Total Cache and LiteSpeed Cache from overwriting drop-in
Fixed ACL username support when using Predis and array syntax

2.4.1

Fix PHP <=7.2 syntax error

2.4.0

Flush cache when toggling the object cache
Show a custom error message when Redis is unreachable
Don’t allow object cache to be enabled when Redis is unreachable
Deprecated risky WP_REDIS_SERIALIZER configuration constant, use WP_REDIS_IGBINARY instead
Support WP_REDIS_USERNAME when using Predis
Show cache hit ratio decimal points in Admin Bar node
Obscure secrets when displaying WP_REDIS_SERVERS
Improved CloudLinux’s Accelerate WP compatibility
Admin bar cache flush now uses AJAX

2.3.0

Show dashboard widget only to admins
Added Admin Bar node (disable using WP_REDIS_DISABLE_ADMINBAR)
Added WP_REDIS_SSL_CONTEXT configuration constant
Throw errors when connection error occurs
Added support for usernames when using Predis
Added support for loading Predis from WP_REDIS_PLUGIN_PATH
Made Predis unix socket connections stricter
Fixed rare group flushing bug
Fixed cluster ping when using Predis
Updated Predis to v2.1.2
Improved documentation

2.2.4

Register wp redis CLI command late
Don’t compete with Object Cache Pro for wp redis command
Prevent Perflab from overwriting the object cache drop-in
Updated Predis to v2.1.1
Avoid type error when transaction fails
Check for incompatible content type headers

2.2.3

Added wp_cache_flush_group() support
Updated Credis to v1.14.0
Drop $delay parameter from wp_cache_flush()
Prevent rare error in diagnostics when reading connection errors

2.2.2

Use QM_Data_Cache instead of QM_Data
Fixed WP_Error use statement non-compound name warning

2.2.1

Added WordPress 6.1 wp_cache_supports() function
Updated Predis to v2.0.3
Avoid early microtime() calls in WP_Object_Cache::get()
Support Query Monitor’s new QM_Data class
Throw exception of pipeline returns unexpected results

2.2.0

Added redis_cache_add_non_persistent_groups filter
Fixed wp_add_dashboard_widget parameters
Fixed WP_REDIS_SERVERS replication issue with Predis v2.0
Fixed WP_REDIS_CLUSTER string support
Fixed issue when MGET fails in get_multiple() call
Fixed several warnings in the event of pipeline failures

2.1.6

Fixed SVN discrepancies

2.1.5

Fixed is_predis() call

2.1.4

Added is_predis() helper

2.1.3

Fixed bug in wp_cache_add_multiple() and wp_cache_set_multiple()

2.1.2

Fixed and improved wp_cache_*_multiple() logic
Call redis_object_cache_set action in wp_cache_set_multiple()
Call redis_object_cache_delete action in wp_cache_delete_multiple()
Check if raw group name is ignored, not sanitized name
Removed tracing

2.1.1

Bumped PHP requirement to 7.2
Renamed WP_REDIS_DIR to WP_REDIS_PLUGIN_DIR
Fixed rare fatal error in diagnostics
Allow Predis v1.1 Composer installs
Support using WP_REDIS_CLUSTER string

2.1.0

Bumped PHP requirement to 7.0
Deprecated Credis and HHVM clients
Updated Predis to v2.0.0
Updated Credis to v1.13.1
Improved cluster readability in diagnostics
Improved connecting to clusters
Fixed pinging clusters after connecting
Fixed several bugs in connect_using_credis()

2.0.26

Fixed a bug in wp_cache_delete_multiple() when using Predis
Fixed a bug in wp_cache_add_multiple() when cache addition is suspended

2.0.25

Removed broken wp_cache_add_multiple() function

2.0.24

Improve metrics label/tooltip formatting
Fix metrics chart not rendering
Updated Predis to v1.1.10
Updated Credis to v1.13.0
Support composer/installers v1 and v2
Link to settings page when foreign drop-in was found
Added wp_cache_flush_runtime() function
Added wp_cache_add_multiple() function
Added wp_cache_delete_multiple() function

2.0.23

Added support for Relay
Minor UX fixes and improvements
Fixed PHP 8.1 deprecation notice
Updated ApexCharts to v3.31.0

2.0.22

PHP 8.1 compatibility fixes
Upgraded to Predis v1.1.9
Added settings link to widget
Overhauled diagnostics pane
Updated ApexCharts to v3.30.0
Redirect to plugin settings after activation
Fixed wrong path to diagnostics.php file
Fixed chart overflow in settings tab
Fixed Predis cluster ping
Avoid warning when content folder is not writeable

2.0.21

Added metrics diagnostics
Added WP_Object_Cache::decr() alias
Moved diagnostics.php file

2.0.20

Fix wp.org release

2.0.19

Make metric identifier unique
Set unique prefix for sites hosted on Cloudways
Don’t print HTML debug comment when WP_CLI is true

2.0.18

Added redis_object_cache_trace action and WP_REDIS_TRACE constant
Updated ApexCharts to v3.26.0
Fixed and issue with WP_REDIS_DISABLE_METRICS

2.0.17

Code cleanup
Fixed missing metrics
Fixed filesystem test

2.0.16

Updated Credis to v1.11.4
Fixed drop-in notice styling
Moved metrics into dedicated class
Added redis_cache_validate_dropin filter
Use WP_DEBUG_DISPLAY (instead of WP_DEBUG) constant to display debug information
Fixed rare error in wp_cache_get_multiple()
Removed intval() usage

2.0.15

Reverted build_key() changes due to issues in multisite environments

2.0.14

Made Object Cache Pro card translatable
Added WP_REDIS_SERIALIZER to diagnostics
Improved speed of build_key()
Support settings WP_REDIS_PREFIX and WP_REDIS_SELECTIVE_FLUSH via environment variable
Added WP_REDIS_METRICS_MAX_TIME to adjust stored metrics timeframe
Delay loading of text domain and schedule until init hook
Upgraded bundled Predis library to v1.1.6
Prevent variable referencing issue in connect_using_credis()

2.0.13

Updated bundled Predis library to v1.1.4
Made redis-cache a global group for improved metrics on multisite
Switched to short array syntax
Added @since tags to all hooks
Use parse_url() instead of wp_parse_url() in drop-in
Fixed plugin instance variable name in wp redis status

2.0.12

Fixed bytes metrics calculation
Fixed an issue with non-standard Predis configurations
Improve WordPress Coding Standards

2.0.11

Fixed an issue in wp_cache_get_multiple() when using Predis
Prevent undefined index notice in diagnostics

2.0.10

Fixed unserializing values in wp_cache_get_multiple()

2.0.9

Highlight current metric type using color
Show “Metrics” tab when metrics are disabled
Refactored connection and Redis status logic
Updated Predis to v1.1.2
Remove Predis deprecation notice
Fixed fetching derived keys in wp_cache_get_multiple()

2.0.8

Fixed tabs not working in 2.0.6 and 2.0.7 due to WP.org SVN issue

2.0.7

Fixed issue with wp_cache_get_multiple()

2.0.6

Added experimental filesystem test to diagnostics
Refactored settings tab logic (fixed jumping, too)
Fixed issues with wp_cache_get_multiple()
Return boolean from wp_cache_delete()
Use redis-cache as JS event namespace
Hide Pro line in widget when banners are disabled
Renamed redis_object_cache_get_multi action to redis_object_cache_get_multiple

2.0.5

Version 2.0 is a significant rewrite of the plugin. Please read the v2.0.0 release notes.

Fixed multisite action buttons not working
Removed outdated PHP 5.4 warning
Added read_timeout support to Credis
Display connection parameters when using Credis
Added wiki link to Predis upgrade notice

2.0.4

Attempt to reliably update the dropin when it’s outdated
Show ACL username on settings screen
Show full diagnostics with wp redis status
Always set FS_CHMOD_FILE when copying the object-cache.php
Don’t encode bullets in password diagnostics
Call redis_object_cache_update_dropin during dropin update

2.0.3

Hide “Metrics” tab when metrics are disabled
Fixed admin.js not loading in multisite environments
Avoid fatal error when interacting with metrics but Redis went away
Added WP_Object_Cache::__get() for backwards compatibility

2.0.2

Updated POT file and comments for translators

2.0.1

Support older versions of Query Monitor
Made “Dropin” status more helpful
Hide Redis version in settings when it isn’t available
Collapsed dependency paths using composer-custom-directory-installer package
Prevent QM_Collector conflicts with other plugins
Prevent metric issues when cache is not available
Fixed “Settings” link in plugin list
Fixed WP_REDIS_DISABLED logic

2.0.0

Version 2.0 is a significant rewrite. The plugin now requires PHP 5.6, just like WordPress 5.2 does.

The GitHub and Composer repository was moved from tillkruss/redis-cache to rhubarbgroup/redis-cache.

On multisite networks, be sure to “Network Activate” the plugin after upgrading to v2.x.

Require PHP 5.6
Plugin is now “network-only”
Switch to WPCS for code standards
Overhauled the settings screen
Added object cache metrics (on dashboard widget and settings)
Added support for Query Monitor
Added Rhubarb\\RedisCache namespace to all files
Added support for WP 5.5’s new wp_cache_get_multi() function
Added redis_object_cache() function to retrieve plugin instance
Added dropin warnings to network dashboard
Added support for setting Sentinel database numbers
Support Redis 6 ACL username and password authentication
Support overwriting existing dropin on setting screen
Use singleton pattern to instantiate plugin
Use Composer to install and load Predis
Update object cache dropin during plugin update
Use separate methods to connect with all clients
Removed CUSTOM_USER_TABLE and CUSTOM_USER_META_TABLE weirdness
Added themes as ignored group
Changed default connection and read timeout to 1 second
Prevent race condition in add_or_replace()
Renamed WP_CACHE_KEY_SALT to WP_REDIS_PREFIX for clarity
Replaced “slave” terminology with “replica”
Only SELECT database when it’s not 0

1.6.1

Fixed issue with footer comment showing during AJAX requests

1.6.0

Improved group name sanitization (thanks @naxvog)
Prevent fatal error when replacing foreign dropin
Added HTML footer comment with optional debug information
Removed prefix suggestions

The HTML footer comment only prints debug information when WP_DEBUG is enabled. To disable the comment entirely, set the WP_REDIS_DISABLE_COMMENT constant to true.

1.5.9

Fixed missing $info variable assignment in constructor
Fixed MaxTTL warning condition
Switched to using default button styles

1.5.8

Added warning message about invalid MaxTTL
Added warning about unmaintained Predis library
Added suggestion about shorter, human-readable prefixes
Added Redis Cache Pro compatibility to settings
Fixed flushing the cache when the prefix contains special characters
Fixed calling Redis INFO when using clusters
Cleaned up the settings a little bit

1.5.7

Added support for PhpRedis TLS connections
Added support for timeout, read timeout and password when using PhpRedis cluster
Fixed issue with INFO command
Fixed object cloning when setting cache keys

1.5.6

Added object cloning to in-memory cache
Fixed PHP notice related to read_timeout parameter

1.5.5

Please flush the object cache after updating the drop to v1.5.5 to avoid dead keys filling up Redis memory.

Removed lowercasing keys
Remove scheduled metrics event
Fixed Redis version call when using replication

1.5.4

Removed metrics

1.5.3

Fixed: Call to undefined function get_plugin_data()
Fixed: Call to undefined method WP_Object_Cache::redis_version()

1.5.2

Added Redis version to diagnostics
Added WP_REDIS_DISABLE_BANNERS constant to disable promotions
Fixed an issue with redis.replicate_commands()

1.5.1

This plugin turned 5 years today (Nov 14th) and its only fitting to release the business edition today as well.
\nObject Cache Pro is a truly reliable, highly optimized and easy to debug rewrite of this plugin for SMBs.

Added execution times to actions
Added WP_REDIS_VERSION constant
Fixed PhpRedis v3 compatibility
Fixed an issue with selective flushing
Fixed an issue with mb_* functions not existing
Replaced Email Address Encoder card with Redis Cache Pro card
Gather version metrics for better decision making

1.5.0

Since Predis isn’t maintained any longer, it’s highly recommended to switch over to PhpRedis (the Redis PECL extension).

Improved Redis key name builder
Added support for PhpRedis serializers
Added redis_object_cache_error action
Added timeout, read-timeout and retry configuration
Added unflushable groups (defaults to ['userlogins'])
Fixed passwords not showing in server list

1.4.3

Require PHP 5.4 or newer
Use pretty print in diagnostics
Throw exception if Redis library is missing
Fixed cache not flushing for some users
Fixed admin issues when WP_REDIS_DISABLED is false

1.4.2

Added graceful Redis failures and WP_REDIS_GRACEFUL constant
Improved cluster support
Added redis_cache_expiration filter
Renamed redis_object_cache_get filter to redis_object_cache_get_value

1.4.1

Fixed potential fatal error related to wp_suspend_cache_addition()

1.4.0

Added support for igbinary
Added support for wp_suspend_cache_addition()

1.3.9

Fixed WP_REDIS_SHARDS not showing up in server list
Fixed WP_REDIS_SHARDS not working when using PECL extension
Removed WP_REDIS_SCHEME and WP_REDIS_PATH leftovers

1.3.8

Switched from single file Predis version to full library

1.3.7

Revert back to single file Predis version

1.3.6

Added support for Redis Sentinel
Added support for sharing
Switched to PHAR version of Predis
Improved diagnostics
Added WP_REDIS_SELECTIVE_FLUSH
Added $fail_gracefully parameter to WP_Object_Cache::__construct()
Always enforce WP_REDIS_MAXTTL
Pass $selective and $salt to redis_object_cache_flush action
Don’t set WP_CACHE_KEY_SALT constant

1.3.5

Added basic diagnostics to admin interface
Added WP_REDIS_DISABLED constant to disable cache at runtime
Prevent “Invalid plugin header” error
Return integer from increment() and decrement() methods
Prevent object cache from being instantiated more than once
Always separate cache key prefix and group by semicolon
Improved performance of build_key()
Only apply redis_object_cache_get filter if callbacks have been registered
Fixed add_or_replace() to only set cache key if it doesn’t exist
Added redis_object_cache_flush action
Added redis_object_cache_enable action
Added redis_object_cache_disable action
Added redis_object_cache_update_dropin action

1.3.4

Added WP-CLI support
Show host and port unless scheme is unix
Updated default global and ignored groups
Do a cache flush when activating, deactivating and uninstalling

1.3.3

Updated Predis to v1.1.1
Added redis_instance() method
Added incr() method alias for Batcache compatibility
Added WP_REDIS_GLOBAL_GROUPS and WP_REDIS_IGNORED_GROUPS constant
Added redis_object_cache_delete action
Use WP_PLUGIN_DIR with WP_CONTENT_DIR as fallback
Set password when using a cluster or replication
Show Redis client in stats()
Change visibility of $cache to public
Use old array syntax, just in case

1.3.2

Make sure $result is not false in WP_Object_Cache::get()

1.3.1

Fixed connection issue

1.3

New admin interface
Added support for wp_cache_get()‘s $force and $found parameter
Added support for clustering and replication with Predis

1.2.3

UI improvements

1.2.2

Added redis_object_cache_set action
Added redis_object_cache_get action and filter
Prevented duplicated admin status messages
Load bundled Predis library only if necessary
Load bundled Predis library using WP_CONTENT_DIR constant
Updated stats() method output to be uniform with WordPress

1.2.1

Added composer.json
Added deactivation and uninstall hooks to delete object-cache.php
Added local serialization functions for better advanced-cache.php support
Updated bundled Predis version to 1.0.3
Updated heading structure to be semantic

1.2

Added Multisite support
Moved admin menu under Settings menu
Fixed PHP notice in get_redis_client_name()

1.1.1

Call select() and optionally auth() if HHVM extension is used

1.1

Added support for HHVM’s Redis extension
Added support for PECL Redis extension
Added WP_REDIS_CLIENT constant, to set preferred Redis client
Added WP_REDIS_MAXTTL constant, to force expiration of cache keys
Improved add_or_replace(), get(), set() and delete() methods
Improved admin screen styles
Removed all internationalization/localization from drop-in

1.0.2

Added “Flush Cache” button
Added support for UNIX domain sockets
Improved cache object retrieval performance significantly
Updated bundled Predis library to version 1.0.1

1.0.1

Load plugin translations
Hide global admin notices from non-admin users
Prevent direct file access to redis-cache.php and admin-page.php
Colorize “Disable Object Cache” button
Call Predis\\Client->connect() to avoid potential uncaught Predis\\Connection\\ConnectionException

1.0

Initial release

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A persistent object cache backend powered by Redis®¹. Supports Predis, PhpRedis (PECL), Relay, replication, sentinels, clustering and WP-CLI.

To adjust the connection parameters, prefix cache keys or configure replication/clustering, see the configuration options.

Object Cache Pro

A business class Redis®¹ object cache backend. Truly reliable, highly optimized, fully customizable and with a dedicated engineer when you most need it.

Rewritten for raw performance
100% WordPress API compliant
Faster serialization and compression
Easy debugging & logging
Cache prefetching and analytics
Fully unit tested (100% code coverage)
Secure connections with TLS
Health checks via WordPress & WP CLI
Optimized for WooCommerce, Jetpack & Yoast SEO

Learn more about Object Cache Pro.

¹ Redis is a registered trademark of Redis Ltd. Any rights therein are reserved to Redis Ltd. Any use by Redis Object Cache is for referential purposes only and does not indicate any sponsorship, endorsement or affiliation between Redis and Redis Object Cache.

Troubleshooting

Answers to common questions and troubleshooting of common errors can be found in the FAQ. Reading these is always faster than waiting for a response in the support forums.

Configuration

The plugin comes with vast set of configuration options and connection examples. Advanced users may consult Scaling and replication

WP CLI commands

Redis Object Cache has various WP CLI commands, for more information run wp help redis after installing the plugin.

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For detailed installation instructions, please read the extensive installation instructions.

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Thanks for this! Let's consider the pro version now.","rating":0.25,"created":{"timestamp":1657843200,"timezone":"UTC"}},{"reviewer":"A5hleyRich","title":"Amazing Results","content":"Redis Object Cache is my go-to plugin for object caching. Database queries are significantly reduced, resulting in quicker load times. This is especially noticeable on dynamic sites running plugins such as WooCommerce and while navigating the WordPress dashboard.","rating":0.25,"created":{"timestamp":1658188800,"timezone":"UTC"}},{"reviewer":"Davor Veselinovic","title":"I recommend this plugin","content":"I'm using a free version of this plugin for more than a year on a couple of my websites. It works great and I can only say, thanks.","rating":0.25,"created":{"timestamp":1660348800,"timezone":"UTC"}},{"reviewer":"dudo","title":"Works, easy peasy.","content":"Once Redis is configurated on the server, this plugin just works.","rating":0.25,"created":{"timestamp":1667520000,"timezone":"UTC"}},{"reviewer":"Jason Cosper","title":"The only way to Redis","content":"\nHands down the best free Redis plugin available. Well maintained, updated regularly, and the developer is responsive to feedback. What's not to love? 😀\n","rating":0.25,"created":{"timestamp":1681862400,"timezone":"UTC"}},{"reviewer":"Gwyneth Llewelyn","title":"Superfast performance boost (for non-beginners only)","content":"\nWarning! This plugin is not meant to be installed by beginners. It's not trivial to configure and relies on an external Redis server to do its magic. If you have never configured an application that relies on a Redis server, or never administered a Redis server yourself, this plugin is NOT for you!Instead, as a beginner, you should rely on one of the many, many other caching plugins out there, some of which are very easy to configure and will give you enough of a performance boost.That said, if you read this far, welcome, Advanced WordPress PowerUser™ :-)As a non-beginner, you should know that caching pages to improve performance only goes so far. WordPress-generated websites are far more dynamic than that (unless, of course, your website rarely changes over the years).Static page caching still gives a performance boost when your site has to serve a lot of requests in a short amount of time (i.e. several per second). Serving a static page directly through the webserver is the perfect choice for such scenarios: generate once, and the rest of the requests made in a short interval will never hit the database (nor even the PHP subsystem), but rather served directly from disk, or, even better, from memory.But what about dynamic page changes that occur all the time, in slightly larger intervals of time? Consider how a visitor browses your site: they might navigate via the menu… but also wading through the related posts widget. Which are generated on demand (or close to it), usually presenting a random selection of posts within the same category or tag (or possibly even with a more complex algorithm). 'Random' means that WordPress cannot serve that bit of the page statically — it has to be pre-generated before it gets delivered to the user. If the user goes back, it's reasonable to presume that a different selection is presented; in fact, site admins often want that behaviour by default.Or consider simple search queries. A 'search query', as the name implies is a database query. You can cache the results of the most popular keywords, but... in most scenarios, it will be quite hard to figure out how common a query will be (before it has been typed in) and for how long it should be cached (which also depends on how often the site gets updated).The same applies to things like sliders or image galleries. Sometimes, their order of appearance is fixed in advance (and thus potentially cacheable). But often it's not. It may be random. It may follow an unusual combination of attributes or preferences. Whatever the reason, one should assume that most dynamically-generated content cannot be effectively cached as a static page — not for more than a few seconds, at least.There are several (complex) solutions to address the shortcomings of static page caching and still 'protect' the database from freezing down under the sheer weight of queries to deal with dynamic content. The higher-end plugins usually implement a series of techniques, sometimes giving the WP admin the possibility to pick the preferred technique, and fine-tune it.WordPress, however, is quite helpful in that regard. One possibility, besides static page caching, is to cache a page object. These can loosely be defined as components of the overall page itself — they can be widgets or content injected by some kind of plugin (often automated by the plugin owner & maintainer); WP allows integrating plugins with what they call the object cache.The most advanced caching plugins out there (I'm not mentioning any names; if you are an Advanced WordPress PowerUser™, you know which they are!) have often the option to use the WP object cache as well (sometimes only on the paid version). These plugins, however, are all-in-one solutions; you cannot, generally speaking, cherry-pick the several layers of caching you can use, using different plugins for each. They also configure everything automatically according to the whims of the developer. This is usually a 'good thing' from the perspective of the technical support team — who, when asked why their configuration doesn't work well, will simply request that the user turns off all plugins except theirs. This might or might not be an option in several (most?) cases. Also, it's not guaranteed that the all-in-one solutions are the best in all cases; rather, they tend to excel on some features, while adding others merely as an afterthought. That is, at least, my own experience; your mileage may vary.Redis Object Cache, by contrast, does one thing, and it does it very well. As the name implies, it ties into the WP object cache mechanism. Instead of writing a pre-cached object to disk (or to the database), however, it saves to a Redis server — which can be orders of magnitude faster (since Redis is extremely efficient at storing data, mostly holding it in memory) than writing to disk (not to mention writing to a relational database!). As a bonus, Redis can be configured with distributed replicas, which is essential when scaling up a webserver to handle more traffic.While minimalist in its approach — Redis Object Cache just requires to know basic details to connect to Redis, the choice of database (Redis only has 16 available...), and an eventual key prefix to avoid conflicts with several WP installations on the same server. In fact, that option requires modifying wp-config.php and is not set by default (which drove me insane when installing Redis Object Cache on a second WP install on the same server!). Hopefully, the author will address this issue in a future release of the plugin, and, by default, chooses a reasonable prefix (such as the WP URL, for example, or, for shorter keys, a hashed version of the URL, or even a UUID generated on the spot when installing). To be honest, 'fixing' my mistake was as easy as to flush Redis (a quasi-instant operation) and configuring different prefixes for the keys; a simple operation, and a minute later, I had both sides happily storing their objects on Redis.This was probably the most catastrophic scenario that may happen with Redis Object Cache if you are an Advanced WordPress PowerUser™ :-) And the fix is simply to flush Redis. It won't matter much anyway, since, within seconds, Redis will quickly fill its memory with new objects.An added bonus is a nice graph that appears on the Dashboard, showing some rough statistics about the access to the Redis server — measured in single-digit milliseconds. That's right. When rendering a page from scratch, speed matters, and you cannot afford waiting more than a few milliseconds for data to arrive from the cache, readily processed. To the best of my knowledge, no other caching plugin can achieve that kind of speed. Except, of course, for the Pro version of Redis Object Cache, which does some extra magic and manages to cut by half the access time (!). How that feat is accomplish is beyond my ability to understand; but for those mission-critical websites out there, where sysadmins are constantly tweaking the infrastructure in order to shave off a few milliseconds here and there for each page access — well, Redis Object Cache Pro may very well be worth the few dollars charged for it.In my personal case, I don't require almost-sub-millisecond performance squeezed out of Redis, so I'm more than happy with the 'standard' version. Its 'limitations' — absent from the Pro version — are not really an issue. I love its bare-bones simplicity — once properly configured and installed, that is — and the consequent performance boost, which, unlike what may happen with a plain old page-caching system, will benefit every user, even on a WP website with almost zero visitors: Redis Object Cache will — by design — also cache the objects for the WP backoffice. Everything that is an object — and that means every component of WP, including all those on the backoffice — will be cached. This makes a lot of sense during the design (or redesign!) phase, where admins will be constantly going to and fro the many WP options, spread across themes and plugins, until the design is finished. These are repetitive tasks — querying for the same article to be edited, or the same page template to load, etc. — which Redis Object Cache handles admirably well.While I have deployed it on several websites on my (single) server — where Redis is locally installed and shared by a lot of other applications, including PHP itself (for session storage — another performance boost that is built-in into PHP if that option is configured), I'm well aware that my use-case scenario (mostly very low traffic websites) is perhaps over-engineered for the small demands placed on the overall system. Nevertheless, I was happy to see that the MariaDB behemoth — by far the most memory-consuming process that is constantly running, non-stop — was notoriously happy after I deployed Redis Object Cache: that seems to mean that the database is not being hit so aggressively as before. It's hard to get a grasp of how important Redis Object Cache has been in keeping the overall CPU + Memory consumption at relatively low levels; my server simply hasn't got enough traffic to be able to make a before-and-after comparison. However, I can see quite noticeable performance boots on the WP backoffice! In fact, on one website currently under development — which has around one thousand articles spread across more than a dozen categories — I have turned off all caching (to make sure that everybody always sees the 'latest version' under development) except for Redis Object Cache, which works so well and deals flawlessly with 'dirty' objects (i.e. those that have been changed through user intervention), unlike most page caches. The responsiveness has gone up 500% or more — but without a 'serious' test, using well-known benchmarking tools, I can only relay my visual experience, filtered through my perceptions; ultimately, I can only affirm that I perceive many things on the backoffice to be five times faster than before, but cannot guarantee that this will be the case for everybody.What I can — and will! — recommend is to do at least one external test to your Redis-supercharged site, from one of the popular websites calculating metrics. You might get a very positive surprise!In conclusion... for the low-traffic websites I manage (roughly two dozen), all running on the same server (which is quite decent, albeit being almost a decade old...), because I'm always fearing to be 'slashdotted' some day, this simple but effective plugin keeps my database server happy all the time — because it gets so little work to effectively do :)This is the kind of \"must use\" plugins that every WordPress installation should have as default. Everybody enjoys faster speed and giving the database server a break!\n","rating":0.25,"created":{"timestamp":1682380800,"timezone":"UTC"}},{"reviewer":"Jono Alderson","title":"Perfect performance","content":"\nThis works seamlessly,persistent object cache joy,I use this always.\n","rating":0.25,"created":{"timestamp":1687305600,"timezone":"UTC"}},{"reviewer":"Sébastien SERRE","title":"Best Redis plugin ever","content":"\nI'm installing it in all website I have to create, and it's really easy to setup.\n\n\n\nThank you for it.\n","rating":0.25,"created":{"timestamp":1687305600,"timezone":"UTC"}},{"reviewer":"Andrew Palmer","title":"Love the speed of the dashboard now","content":"\nCaching of the WordPress back end has never been better. If you're not using backend caching use this. \n","rating":0.25,"created":{"timestamp":1687305600,"timezone":"UTC"}}],"screenshots":"

$\"Plugin$
Plugin settings, connected to a single Redis server.
$\"Plugin$
Plugin settings, displaying recent response time metrics.
$\"Plugin$
Plugin settings, showing diagnostic information.
$\"Dashboard$
Dashboard widget, displaying recent response time metrics.

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Redis Object Cache vs Redis Object Cache