SuperHertz Cache Preloader

SuperHertz Cache Preloader is a powerful companion plugin for LiteSpeed Cache that ensures your pages, posts, products, and custom post types are always pre-warmed in the cache — so no visitor ever hits a cold, uncached page.

Why You Need a Cache Preloader

LiteSpeed Cache is incredibly fast, but it only caches pages after the first visitor requests them. That first visitor gets a slow, uncached response. This plugin solves that by proactively crawling every public URL on your site to build the cache before any real visitor arrives.

Key Features

• Automatic Site Crawling — Discovers and warms all public pages, posts, products (WooCommerce), and custom post types automatically.
• Parallel Processing Engine — Multi-threaded cURL engine processes multiple URLs simultaneously for faster warm-up times.
• Sequential Mode — Optional single-threaded mode for shared hosting or resource-constrained environments.
• Smart Throttle Guard — Automatically reduces concurrency when server RAM exceeds 85% or CPU load exceeds 5.0 to protect your server.
• TTFB Latency Tracking — Monitors Time To First Byte per URL and flags slow pages (> 2.0s).
• Server Load Monitoring — Real-time dashboard cards showing Memory Footprint, CPU Load, OpCache status, and Database Query metrics.
• Configurable Concurrency — Set parallel thread count from 2x to 25x based on your server capacity.
• Adjustable Rest Delay — Configure pause between requests (0ms to 500ms) to balance speed vs. server load.
• Scheduled Cron Warming — Set automatic daily, twice-daily, or hourly cache warming with custom start times.
• Manual One-Click Warming — Trigger a full cache warm-up from the admin dashboard at any time.
• Per-URL Debug Logging — Detailed console showing HTTP status, TTFB, cache HIT/MISS status, and LiteSpeed headers for every URL.
• Auto Log Clearing — Debug logs automatically clear on each new run for clean diagnostics.
• Smart Cache Bypass — Automatically excludes cart, checkout, account, and dashboard pages from warming.
• Admin Bar Protection — Prevents WordPress Admin Bar from being cached for non-admin users (vendors, customers, guests).
• ESI-Aware Crawling — Sends proper ESI and cache-control headers during warm-up requests.
• V8 Module Pre-Warming — Injects modulepreload hints for JavaScript bundles to eliminate client-side cold starts.
• WP-CLI Support — Run cache warming from the command line with wp superhertz-cache-preloader warm.
• Full-Width Admin Panel — Clean, modern dashboard UI that uses your full screen width.

How It Works

1. The crawler engine queries WordPress for all published pages, posts, products, and custom post types.
2. It builds a URL queue and sends HTTP requests (with LiteSpeed-compatible headers) to each URL.
3. LiteSpeed Cache intercepts these requests and stores the rendered pages in its cache.
4. When a real visitor arrives, they get the pre-cached version instantly.

Server Requirements

• LiteSpeed Web Server (OpenLiteSpeed or LiteSpeed Enterprise)
• LiteSpeed Cache plugin installed and activated
• PHP 7.4 or higher
• WordPress 5.8 or higher