WhySlow - WordPress Performance Plugin That Tells You Which Plugin Is Slow (Query Monitor Alternative)

Find out exactly which WordPress plugin is slowing your site down - in plain English.

Slow WordPress sites are almost always caused by a single misbehaving plugin. Query Monitor is powerful but throws 500 SQL statements at you. Google PageSpeed says "reduce JavaScript" but never tells you which script from which plugin. GTmetrix tells you your site is slow without telling you why. Cache plugins hide the problem instead of solving it.

Why WhySlow beats the alternatives: WhySlow is the only free WordPress performance plugin that measures every database query, every enqueued script, every HTTP call - then attributes each one to the plugin that caused it. The report is ranked worst-first in plain English: "WooCommerce is running 47 queries on your homepage", "Elementor is loading its full asset bundle on a page you built with Gutenberg". Built for site owners, not developers.

Zero overhead when idle

WhySlow only runs when you explicitly click Analyze. On normal visitor traffic it adds nothing measurable. Safe for production stores handling live orders.

What you get for free

On-demand page profiling - analyze any URL on your site with full plugin-level timing attribution, query count, memory, HTTP calls.

Per-plugin blame - know exactly which plugin ran which query, enqueued which script, made which external HTTP call.

Plain-English findings - no jargon, no stack traces. Each issue explained in one sentence.

N+1 query detection - automatically flags plugins that repeat the same query dozens of times per pageview.

Full-site sitemap audit - walks your XML sitemap and profiles up to 50 pages with a live progress bar.

Speed score (0-100) - letter-graded score based on your 7-day report average. Watch it move as you fix things.

30-day trend graphs - per-URL SVG chart of load time over the last 30 days.

Compare two reports - side-by-side diff. Prove a fix worked or catch a regression in seconds.

Autoload cleanup tool - lists the largest autoloaded options with per-plugin attribution. Disable autoload on the ones you don't need.

Transient management - one click clears expired transients or all of them.

WP-Cron overview - every scheduled task with next run time and frequency.

Built-in performance rules for WooCommerce, Elementor, Contact Form 7, WPForms, Wordfence, ACF Pro, Yoast, Rank Math, GeneratePress and other popular plugins.

Description

Find out exactly which WordPress plugin is slowing your site down - in plain English.

Zero overhead when idle

WhySlow only runs when you explicitly click Analyze. On normal visitor traffic it adds nothing measurable. Safe for production stores handling live orders.

What you get for free

On-demand page profiling - analyze any URL on your site with full plugin-level timing attribution, query count, memory, HTTP calls.
Per-plugin blame - know exactly which plugin ran which query, enqueued which script, made which external HTTP call.
Plain-English findings - no jargon, no stack traces. Each issue explained in one sentence.
N+1 query detection - automatically flags plugins that repeat the same query dozens of times per pageview.
Full-site sitemap audit - walks your XML sitemap and profiles up to 50 pages with a live progress bar.
Speed score (0-100) - letter-graded score based on your 7-day report average. Watch it move as you fix things.
30-day trend graphs - per-URL SVG chart of load time over the last 30 days.
Compare two reports - side-by-side diff. Prove a fix worked or catch a regression in seconds.
Autoload cleanup tool - lists the largest autoloaded options with per-plugin attribution. Disable autoload on the ones you don't need.
Transient management - one click clears expired transients or all of them.
WP-Cron overview - every scheduled task with next run time and frequency.
Built-in performance rules for WooCommerce, Elementor, Contact Form 7, WPForms, Wordfence, ACF Pro, Yoast, Rank Math, GeneratePress and other popular plugins.