Mark McNeece of 365i

365i Performance Optimizer is a comprehensive performance plugin that combines essential speed optimizations into one easy-to-use settings page. Perfect for developers and site owners who want granular control without editing functions.php.
<h4>Why Choose This Plugin?</h4>
<ul>
<li>Elementor-Safe – Automatically detects edit/preview mode and disables optimizations to prevent conflicts.</li>
<li>No External Services – All optimizations run locally. No data sent to third parties. GDPR-friendly.</li>
<li>Granular Control – Toggle each feature independently. Use profiles for quick setup or fine-tune every setting.</li>
<li>WordPress.org Compliant – Follows all coding standards, proper sanitization, and clean uninstall.</li>
</ul>
<h4>Core Performance Features</h4>
<ul>
<li>Speculative Loading – Uses WordPress 6.9+ Speculation Rules API to prefetch likely next pages.</li>
<li>Preconnect & Preload – Resource hints for critical CSS, fonts, and hero images with one-click auto-detection.</li>
<li>Script Deferral – Defer render-blocking scripts while protecting jQuery, Elementor, and core handles.</li>
<li>Cleanup – Remove emoji scripts, embeds, REST links, oEmbed discovery, and disable XML-RPC.</li>
<li>Image Optimization – Set fetchpriority=”high” on LCP candidates and control lazy-loading behavior.</li>
</ul>
<h4>Advanced Features (New in 2.0)</h4>
<ul>
<li>JavaScript Delay – Don’t load non-critical scripts until user interacts (scroll, click, touch, keypress). Dramatically improves initial page load.</li>
<li>Local Google Fonts – Download and serve Google Fonts from your server. Eliminates external requests and ensures GDPR compliance.</li>
<li>Heartbeat Control – Reduce or disable WordPress Heartbeat API to save server resources.</li>
<li>WooCommerce Optimization – Conditionally load cart fragments, styles, and block styles only on shop pages.</li>
<li>Database Cleanup – Remove post revisions, auto-drafts, spam comments, orphaned data, and expired transients. Manual or scheduled.</li>
<li>Query String Removal – Strip ?ver= parameters from static assets for better CDN caching.</li>
</ul>
<h4>Safety & Management</h4>
<ul>
<li>Settings Backups – Automatic snapshots before every save. Keep up to 5 backups with one-click restore.</li>
<li>Configuration Profiles – Safe Mode, Balanced, and Aggressive presets. Save custom profiles for different scenarios.</li>
<li>Import/Export – Transfer settings between sites as JSON. Perfect for agencies and multi-site setups.</li>
<li>Per-Page Overrides – Disable specific optimizations on problem pages via a simple meta box.</li>
<li>Dashboard Widget – Quick overview of active optimizations without leaving the dashboard.</li>
</ul>
<h4>Perfect For</h4>
<ul>
<li>Elementor users wanting safe performance gains</li>
<li>WooCommerce stores needing faster non-shop pages</li>
<li>GDPR-conscious sites requiring local font hosting</li>
<li>Developers managing multiple WordPress sites</li>
<li>Anyone wanting a comprehensive, well-documented performance solution</li>
</ul>

365i Performance Optimizer

Speed up WordPress with speculation rules, script deferral, local Google Fonts, database cleanup, and WooCommerce optimization. Elementor-safe.

Forge12 Interactive GmbH

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.
<h4>Features</h4>
Analysis & Diagnostics
<ul>
<li>Server analysis (PHP, MySQL, OPcache, web server, SSL, HTTP/2, compression)</li>
<li>Automatic site crawler with load time measurement (desktop & mobile)</li>
<li>Asset analysis (CSS, JS, images) with optimization potential</li>
<li>OPcache status & configuration recommendations</li>
<li>PHP profiler (runtime, queries, hooks, plugin ranking, culprit analysis)</li>
<li>Plugin impact analysis (assets, hooks, queries per plugin)</li>
<li>PageSpeed Insights integration (Lighthouse Scores + Core Web Vitals + CrUX)</li>
<li>Performance score with 6 weighted categories (A-F grades, trend delta)</li>
<li>Recommendation engine with automatic optimization suggestions</li>
</ul>
Optimization Tools
<ul>
<li>Lazy Loading (images and iframes)</li>
<li>Font Display Optimization (font-display: swap/optional/fallback/block)</li>
<li>Script Defer Manager (automatic defer for scripts with exclusion list)</li>
<li>Auto Image Dimensions (prevents Layout Shifts / CLS)</li>
<li>HTML Minification (whitespace, comments, empty attributes)</li>
<li>CSS/JS Minification (file-based cache)</li>
<li>WordPress Bloat Removal (emojis, embeds, Dashicons, jQuery Migrate, XML-RPC, Heartbeat, and more)</li>
<li>Browser Cache (.htaccess-based)</li>
<li>DNS Prefetch & Preconnect (domain detection from asset scan)</li>
<li>Database Analysis (8 categories with detail view)</li>
<li>Autoload Manager (granular wp_options management)</li>
<li>Background Asset Scanner with conflict detection</li>
<li>File-based Page Cache with TTL and URL exclusion (Pro)</li>
<li>CSS/JS Asset Manager – disable, defer, async per page or globally (Pro)</li>
<li>Conditional Loading – shortcode, block, regex, archive, login status, post type, plugin (Pro)</li>
<li>Smart auto-suggestions with source-based plugin detection after full scan (Pro)</li>
<li>Asset Preload Manager – Link headers for critical assets (Pro)</li>
<li>Critical CSS Generator & Applier – above-the-fold CSS per template (Pro)</li>
<li>Unused CSS Removal – per page template, safelist, regex safelist (Pro)</li>
<li>WebP Image Conversion with batch queue and backup (Pro)</li>
<li>LQIP Image Placeholders – 20px blur-up previews with IntersectionObserver (Pro)</li>
<li>Preload Key Requests – LCP images, fonts, critical resources (Pro)</li>
<li>Script Delay – delays third-party JS until first user interaction (Pro)</li>
<li>Local Google Fonts – GDPR-compliant WOFF2 self-hosting (Pro)</li>
<li>YouTube/Vimeo Facade – thumbnail + play button instead of iframe (Pro)</li>
<li>Database Cleanup – one-click per category or bulk action (Pro)</li>
<li>Redis Object Cache Management – drop-in installation/removal (Pro)</li>
<li>Scheduled Crawls & Cleanups via WP-Cron (Pro)</li>
<li>Performance Budgets with email/webhook notifications (Pro)</li>
<li>Settings Import/Export as JSON (Pro)</li>
<li>One-Click Optimizer – automated optimization with backup & restore (Pro)</li>
<li>License Management with activation/deactivation (Pro)</li>
</ul>
User Interface
<ul>
<li>Modern iOS-style design system</li>
<li>React 18 + TypeScript SPA</li>
<li>30+ pages/tools with dedicated configuration</li>
<li>Context-sensitive info sections on all pages</li>
<li>Pro features visible with lock icon and upgrade prompt</li>
</ul>
<a href="https://www.forge12.com/f12-profiler-pro/" rel="nofollow ugc">Get F12 Profiler Pro</a>
<h4>System Requirements</h4>
<ul>
<li>WordPress 6.0 or higher</li>
<li>PHP 8.0 or higher</li>
<li>MySQL 5.7 / MariaDB 10.3 or higher</li>
</ul>

F12 Profiler

Excellent! After P3 doesn’t work with PHP7+ anymore, F12 seems finally the one stepping in to fill that gap.

Update [18-Jun-19]. After some small contributions of mine to the dev efforts, the plugin developer has decided to add me to the team, long after this review was written.

Finally an alternative to P3

Comprehensive WordPress performance analysis with crawling, load time measurement, server diagnostics, and integrated optimization tools. Free.

365i Performance Optimizer vs F12 Profiler