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.

bruandet

nintechnet

<h4>A profiler to measure the performance of your WordPress plugins and themes.</h4>
Code Profiler helps you to measure the performance of your plugins and themes at the PHP level and to quickly find any potential problem in your WordPress installation.
You can profile the frontend and backend of WordPress, as well a cron events, a custom URL, send a POST payload, custom cookies and HTTP headers to profile a contact form, a checkout process or an AJAX action among many other possibilities.
It generates an extremely detailed and easy to read analysis in the form of charts and tables that shows not only which plugin or theme, but also which PHP script, class, method and function is slowing down your website. It displays many useful additional information such as database queries, file I/O operations and disk I/O usage as well.
It makes it very simple to locate any bottleneck problem in your themes or plugins in order to solve it and speed up your website. 
Install, activate it and you can start profiling your site right away.
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/3PLDk-ZvQtU?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
<h4>Features</h4>
<ul>
<li>Plugins & themes performance profiling.</li>
<li>[Pro] Scripts performance profiling.</li>
<li>[Pro] Methods & functions performance profiling.</li>
<li>[Pro] Database queries performance.</li>
<li>[Pro] Remote connections monitoring.</li>
<li>[Pro] File I/O operations monitoring.</li>
<li>File I/O statistics.</li>
<li>Disk I/O monitoring.</li>
<li>WP-CLI integration.</li>
<li>Export charts in PNG image format.</li>
<li>GET/POST methods, custom cookies and HTTP headers.</li>
<li>[Pro] Export all tables and charts in CSV file format.</li>
<li>[Pro] Filtering options</li>
</ul>
Learn more about <a href="https://nintechnet.com/codeprofiler/" rel="nofollow ugc">Code Profiler Pro</a>.

Code Profiler – WordPress Performance Profiling and Debugging Made Easy

Kudos to this amazing plugin. This was a dream, and now it's real!

The dream of many developer is now real


I am a developer of premium plugins, and I was able to discover a real bottleneck in our own plugin with this profiling tool. I use the PRO version for this, worth any money, and the breakdown by script file / method / execution time is great!



I don't know what magic is behind this (probably the calculation based on the backtrace), but it's awesome and doesn't require another PHP extension.


This is truly amazing!


This plugin is not much good without the pro upgrade. Seems unfair that I need to buy an annual subscription so I can run this plugin once or twice to fix issues and then never use it again. I understand the product  needs to be maintained but the fee is way too high for a single use. 


Pro is too expensive


This worked surprisingly well! Very useful settings. Much better than the old P3 profiler.  


Worked surprisingly well


I love Code Profiler, with it I can figure out which plugins have a poor performance and I can think about if this plugin is really that important to have or if I can just throw it out.



After having a specific problem with my site I posted a feature request in the forum, they were working on it quickly and the support was very good! I bought the premium version and I am impressed. I could lower the loading speed of some of my sites by 50-70% because Code Profiler helped me identify the problems.


I love it sooo much


Having looked at the screenshots before installing this plugin, I was dismayed to find that most of them refer to the premium version. 



I don't think it's acceptable that the screenshots attached to the free version of the plugin should be for the paid-for pro version - this is false advertising in my eyes. 


Deceptive advertising practices


Great support that goes far beyond supporting the plugin itself 🙏😊


Great support


Thanks, bought premium after free version showed a problem with WP Offload Media plugin. Pro version showed much more, glad I purchased.


Excelent


It's hard to believe you get all this for free. I can't even imagine what the paid version could offer more than the free. Thanks a lot.


Perfect

Very nice plugin and coded well!

A profiler to measure the performance of your WordPress plugins and themes.

F12 Profiler vs Code Profiler – WordPress Performance Profiling and Debugging Made Easy