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Flexa Cache
Flexa Cache

Flexa Cache

0/5 (0 ratings) — active installs Updated Sep 20, 2026
cacheobject cachepage cacheperformanceredis
Download v1.3.0
General settings — enable caching, preload the cache by crawling the site, widget cache, a separate mobile copy, and the admin language.

General settings — enable caching, preload the cache by crawling the site, widget cache, a separate mobile copy, and the admin language.

Flexa Cache is a full-featured WordPress page-cache and front-end optimization plugin. It installs a self-contained advanced-cache.php drop-in that serves compressed static HTML files before WordPress even loads — the same technique used by WP Fastest Cache and W3 Total Cache — giving you maximum TTFB improvement on both Apache and nginx hosts.

Page Cache

  • Static HTML cache served by a pre-WordPress drop-in (no PHP/MySQL on cache hits)
  • Gzip pre-compressed .gz files served natively
  • Separate mobile cache variant (index-mobile.html) when Mobile Theme is enabled
  • Smart invalidation: purge on new post, updated post, comments, theme/menu/widget changes, and WooCommerce product/stock updates
  • Per-URL cache purge from the admin UI, WP-CLI, or REST API
  • Cache preloader via Action Scheduler (or WP-Cron fallback) with start/cancel/status controls
  • Widget output cache with O(1) versioned-key invalidation

Front-End Optimization

  • Minify HTML (whitespace collapse) and Minify HTML Plus (inline CSS/JS trim)
  • Minify CSS and Minify CSS Plus (deeper punctuation squeeze)
  • Combine CSS — adjacency-only buffer fusion preserving cascade order
  • Combine JS / Combine JS Plus — concatenate header and footer scripts
  • Gzip — mod_deflate .htaccess block for dynamic (non-cached) responses
  • Browser Caching — Expires/Cache-Control .htaccess block
  • Disable Emojis — remove WordPress emoji scripts, styles, and DNS prefetch
  • Lazy Load — native loading="lazy" + decoding="async" on images and iframes
  • Render Blocking JS — add defer to render-blocking scripts
  • Google Fonts Async — rewrite Google Fonts <link> to preload + onload swap with <noscript> fallback
  • Delay JS — neutralise non-critical external scripts until first user interaction or 7-second idle fallback

Developer-Friendly

  • WP-CLI: wp flexa-cache clear [--url=<url>], wp flexa-cache status, wp flexa-cache preload [start|status|cancel]
  • REST API: /flexa-cache/v1/cache/purge, /cache/stats, /cache/preload
  • Filterable hooks: flexa_cache/engine/is_cacheable, flexa_cache/engine/buffer, flexa_cache/store/dir, flexa_cache/purged, flexa_cache/settings/languages, and more
  • Kill switch: ?flexa_cache_optimize=0 disables optimization for a single admin request
  • Exclusion lists for URLs, cookies, user agents, CSS handles, and JS handles

Object Cache (Redis)

  • Persistent Redis object cache: caches WordPress options, transients, and post/term/user meta and query results across requests, cutting database load
  • Installs a self-contained object-cache.php drop-in with an in-memory L1 + Redis L2 layout
  • One-click enable/disable and a “Test & save connection” form that writes the config to wp-config.php (secrets never touch the database)
  • Crash-safe by design: if Redis becomes unreachable the site keeps running (degrades to in-memory) with an admin notice and a circuit breaker — never a white screen
  • Serializers (PHP, igbinary, JSON, msgpack) and compression (LZ4, Zstd, LZF), key prefetch, and alloptions splitting
  • Live analytics: hit-ratio / operations / memory charts, a per-group key table, Query Monitor panel, and WP-CLI (analytics, watch, groups, slowlog)
  • Multisite aware, with per-site and network flush scopes
  • Advanced Redis topologies — Cluster, Sentinel, Replicated (master/replica), and the Relay/Predis clients — are available through the separate Flexa Cache Pro add-on

Source code for compiled JavaScript and CSS

The plugin ships a compiled admin UI in assets/dist/. The human-readable
source (apps/admin/src) and the build tooling are publicly available at:

https://github.com/flexatech/flexa-cache

The admin UI is built with npm and Vite:

  1. npm install
  2. npm run build (or npm run dev for a watched dev build with HMR)

External services

Caching and optimization run entirely on your own server. The plugin connects to one external service, and only in the admin, for the reason below.

Deactivation feedback (Flexa Product Intelligence)

When you go to deactivate Flexa Cache on the Plugins screen, a short optional survey asks why. It is served by Flexa’s product intelligence service at https://product-intelligence.flexacommerce.com. It runs only on wp-admin/plugins.php, never on the front end, and never blocks or delays deactivation.

  • What is sent, and when: on opening the Plugins screen, a request to /api/v1/config (the product slug and tier) loads the survey configuration, cached for 6 hours. When you deactivate or interact with the survey, the reason you pick and any optional message you type are sent to /api/v1/deactivations, /api/v1/events, /api/v1/feedback, /api/v1/feature-requests, and /api/v1/recovery-events. If you later reactivate the plugin, a single /api/v1/recovery-events request records the reactivation and how long the plugin was inactive.
  • What is included: an anonymous per-site identifier (a random UUID), the plugin version and tier, and by default your WordPress/PHP version and locale. No email, site domain, user identity, or raw IP is collected.
  • Opt out: turn the environment data off with add_filter( 'flexa_cache/deactivation_survey/config', fn( $c ) => array( 'collect_environment' => false ) + $c );, or disable the whole survey with add_filter( 'flexa_cache/deactivation_survey/enabled', '__return_false' );.

Service terms and privacy policy: https://flexacommerce.com/pages/terms and https://flexacommerce.com/pages/privacy