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manifest / performance / relay-wordpress-plugin

Relay Cache

The next-generation caching. Relay is a modern PHP extension that combines the functions of a Redis client with an in-process shared memory cache.

by NoorDev · github.com/noordevtech/relay-wordpress-plugin · website

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Install

No release zip yet. The repository archive installs, but the folder name will carry the branch suffix and updates will not flow:

wp plugin install https://github.com/noordevtech/relay-wordpress-plugin/archive/refs/heads/main.zip
Readme github.com/noordevtech/relay-wordpress-plugin ↗

Relay Cache — WordPress Plugin

A WordPress object cache plugin backed by the Relay PHP extension. Relay combines a Redis client with an in-process shared memory cache, serving frequently accessed entries directly from PHP memory and avoiding most Redis round-trips.

Why Relay?

  • Up to 8× faster response times vs. PhpRedis for cache-hit heavy workloads
  • Higher hit ratio thanks to a local in-process cache layer
  • Lower Redis load and more stable memory usage
  • Higher throughput under heavy traffic
  • Ideal for high-traffic sites, large WooCommerce stores, headless WordPress, LMS/membership platforms, and performance-focused hosting stacks.

Requirements

Installation

  1. Copy this plugin directory to wp-content/plugins/relay-cache.
  2. Activate Relay Cache in the WordPress admin.
  3. Go to Settings → Relay Cache and configure your Redis connection (host, port, password, database, prefix, timeout).
  4. Click Enable Object Cache to install the wp-content/object-cache.php drop-in.

Configuration via wp-config.php

Optional constants that override the settings stored in the database:

define( 'WP_RELAY_HOST',     '127.0.0.1' );
define( 'WP_RELAY_PORT',     6379 );
define( 'WP_RELAY_PASSWORD', 'secret' );
define( 'WP_RELAY_DATABASE', 0 );
define( 'WP_RELAY_PREFIX',   'mysite:' );
define( 'WP_RELAY_TIMEOUT',  1.0 );

Features

  • Full WP_Object_Cache API implementation (add, set, get, delete, incr, decr, multi-key variants, flush, flush_runtime, flush_group).
  • Multisite-aware key namespacing with global and non-persistent group support.
  • Safe fallback: if Relay isn't loaded or the connection fails, WordPress transparently falls back to its default in-memory cache for the request.
  • Admin UI shows extension status, drop-in status, and a live connection test.
  • One-click install / remove of the object-cache.php drop-in and a cache flush button.

How it works

The plugin ships a WordPress object-cache drop-in (dropins/object-cache.php) which is copied to wp-content/object-cache.php when enabled. The drop-in creates a \Relay\Relay client, proxies all wp_cache_* calls through it, and keeps a per-request runtime cache for the lowest possible latency. Relay itself additionally maintains a shared in-process memory cache across requests, so most reads never hit the network at all.

License

GPL-2.0-or-later