F12 Profiler analyzes your WordPress site comprehensively and delivers concrete, prioritized recommendations to improve load times. The plugin combines server diagnostics, asset analysis, database optimization, and plugin impact assessment in a modern, clean interface.
Features
Analysis & Diagnostics
- Server analysis (PHP, MySQL, OPcache, web server, SSL, HTTP/2, compression)
- Automatic site crawler with load time measurement (desktop & mobile)
- Asset analysis (CSS, JS, images) with optimization potential
- OPcache status & configuration recommendations
- PHP profiler (runtime, queries, hooks, plugin ranking, culprit analysis)
- Plugin impact analysis (assets, hooks, queries per plugin)
- PageSpeed Insights integration (Lighthouse Scores + Core Web Vitals + CrUX)
- Performance score with 6 weighted categories (A-F grades, trend delta)
- Recommendation engine with automatic optimization suggestions
Optimization Tools
- Lazy Loading (images and iframes)
- Font Display Optimization (font-display: swap/optional/fallback/block)
- Script Defer Manager (automatic defer for scripts with exclusion list)
- Auto Image Dimensions (prevents Layout Shifts / CLS)
- HTML Minification (whitespace, comments, empty attributes)
- CSS/JS Minification (file-based cache)
- WordPress Bloat Removal (emojis, embeds, Dashicons, jQuery Migrate, XML-RPC, Heartbeat, and more)
- Browser Cache (.htaccess-based)
- DNS Prefetch & Preconnect (domain detection from asset scan)
- Database Analysis (8 categories with detail view)
- Autoload Manager (granular wp_options management)
- Background Asset Scanner with conflict detection
- File-based Page Cache with TTL and URL exclusion (Pro)
- CSS/JS Asset Manager – disable, defer, async per page or globally (Pro)
- Conditional Loading – shortcode, block, regex, archive, login status, post type, plugin (Pro)
- Smart auto-suggestions with source-based plugin detection after full scan (Pro)
- Asset Preload Manager – Link headers for critical assets (Pro)
- Critical CSS Generator & Applier – above-the-fold CSS per template (Pro)
- Unused CSS Removal – per page template, safelist, regex safelist (Pro)
- WebP Image Conversion with batch queue and backup (Pro)
- LQIP Image Placeholders – 20px blur-up previews with IntersectionObserver (Pro)
- Preload Key Requests – LCP images, fonts, critical resources (Pro)
- Script Delay – delays third-party JS until first user interaction (Pro)
- Local Google Fonts – GDPR-compliant WOFF2 self-hosting (Pro)
- YouTube/Vimeo Facade – thumbnail + play button instead of iframe (Pro)
- Database Cleanup – one-click per category or bulk action (Pro)
- Redis Object Cache Management – drop-in installation/removal (Pro)
- Scheduled Crawls & Cleanups via WP-Cron (Pro)
- Performance Budgets with email/webhook notifications (Pro)
- Settings Import/Export as JSON (Pro)
- One-Click Optimizer – automated optimization with backup & restore (Pro)
- License Management with activation/deactivation (Pro)
User Interface
- Modern iOS-style design system
- React 18 + TypeScript SPA
- 30+ pages/tools with dedicated configuration
- Context-sensitive info sections on all pages
- Pro features visible with lock icon and upgrade prompt
System Requirements
- WordPress 6.0 or higher
- PHP 8.0 or higher
- MySQL 5.7 / MariaDB 10.3 or higher
