Flexa Cache

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)