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MITS Profiler is a tool by <a href="https://mits.pl" rel="nofollow ugc">MITS</a> — a WordPress and WooCommerce agency based in Poland. It adds a diagnostic bar to any page by appending <code>?mits_prof=1</code> to the URL. It captures timing data from the moment PHP starts and presents it in a dark-themed panel at the bottom of the page — visible only to logged-in administrators.
Tabs included:
<ul>
<li>Timeline — absolute and relative timing between WordPress lifecycle hooks (plugins_loaded → init → wp_head → wp_footer)</li>
<li>Hooks — top 50 slowest action/filter hooks with total time and call count</li>
<li>Options — most-queried WordPress options + full autoload audit with sizes</li>
<li>Plugins — loaded PHP file sizes per plugin (proxy for load time)</li>
<li>Assets — all enqueued scripts and styles, external ones highlighted</li>
<li>HTTP — outgoing wp_remote_* requests with response time and status</li>
<li>SQL — all database queries with slow-query highlighting (requires SAVEQUERIES)</li>
<li>PHP — PHP version, OPcache status and hit rate, memory and execution limits</li>
</ul>
Key features:
<ul>
<li>Zero HTTP loopback — works behind Cloudflare, reverse proxies and strict firewall rules</li>
<li>No external dependencies or requests</li>
<li>Admin-only: the panel and all data are never shown to guests</li>
<li>Export to JSON or CSV for offline analysis</li>
<li>Works on front-end pages, WooCommerce pages, and WP Admin</li>
</ul>
SQL query logging requires adding the following to <code>wp-config.php</code>:
<pre><code>define('SAVEQUERIES', true);
</code></pre>

MITS Profiler

Lightweight WordPress performance profiler. No HTTP loopback requests — works behind Cloudflare and any proxy.

This plugin measures the time it takes your checkout to load using hooks. All events are logged to files via the WooCommerce Logger Class. View them via WooCommerce >> Status >> Logs. 
The WooCommerce Block Checkout is not yet supported. You must use the classic shortcode based checkout for now.
<h3>Feature list</h3>
<ul>
<li>Timer function for WooCommerce Shortcode Checkout aka Classic Checkout.</li>
</ul>
<h3>Roadmap</h3>
<ul>
<li>Timer function for WooCommerce Blocks Checkout</li>
</ul>
<h3>Documentation and Support</h3>
More documentation at my website. https://conschneider.de/checkout-profiler-for-woocommerce/

Checkout Profiler for WooCommerce

Wondering whether your WooCommerce checkout is slow? This plugin will tell you.

MITS Profiler vs Checkout Profiler for WooCommerce