Description

Speedix profiles PHP execution on your WordPress site, showing exactly which hooks and plugins are slow. Unlike page speed tests that just show load time, Speedix shows you why your site is slow.

Built for developers, agencies, and site administrators who need to diagnose performance issues at the code level.

What It Does

Measures every WordPress hook with microsecond precision and traces slow callbacks back to their source plugins using PHP Reflection. You get a clear breakdown of where time is spent: Core vs Theme vs Plugins.

The dashboard shows a health score (0-100), highlights the slowest hooks, and tracks performance trends over time. WooCommerce sites get a dedicated tab with categories for Checkout, Cart, Products, Orders, and more.

Safe for Production

Sample rate control (10-100% of requests)
Threshold filtering to only log slow hooks
Overload protection auto-pauses if overhead spikes
Auto-cleanup from 1 hour to 7 days retention

Quick presets let you switch between Safe Mode (10% sampling), Balanced, or Detailed profiling with one click.

WooCommerce Support

Works with HPOS (Custom Order Tables) and Cart/Checkout Blocks. Tracks checkout complexity: payment gateways, shipping methods, coupons, and session size.

Export Options

CSV, JSON, and Markdown exports for reporting and analysis.

Why Not a Page Speed Test?

GTmetrix and PageSpeed measure frontend delivery. Speedix measures server-side PHP execution. They answer different questions. Use both.

Privacy

All data stays in your WordPress database. No external API calls, no tracking, no telemetry. GDPR compliant by design.

100% Free

Every feature is included. No pro version, no upsells.

Screenshots

Dashboard Simple View – Health Score, Response Time, and Top Time Consumers at a glance
Dashboard Advanced View – Full metrics with plugin breakdown and trend charts
By Hook tab – Hook timing table with plugin attribution badges and expandable callbacks
WooCommerce tab – Hook categories for Checkout, Cart, Products with page timing cards
Per-Page tab – Individual page performance with response time history
Settings page – Quick Presets, profiling controls, and auto-calibration
Response Time History – Click any metric to view historical trends
External API History – Track slow external HTTP calls with detailed breakdown

Installation

Upload the plugin files to /wp-content/plugins/speedix/
Activate the plugin through the ‘Plugins’ menu in WordPress
Go to Tools > Speedix
Complete the Quick Setup wizard (recommended) or configure manually
Enable profiling and visit your site to start collecting data

FAQ

Will this slow down my site?

Minimal impact when configured properly. Use “Safe Mode” preset (10% sampling, 2ms threshold) for production sites. The plugin includes overload protection that automatically pauses profiling if overhead exceeds safe limits.

Will this break my site?

No. Speedix uses read-only profiling with built-in safety limits. If overhead gets too high, it automatically pauses for 1 hour. You can also disable at any time from Settings.

How is this different from debugging plugins?

Debugging plugins show detailed info about the current request. Speedix takes a different approach – it aggregates performance data over time to identify persistent slow spots and trends across many page loads.

Why am I seeing 0 hooks collected?

Check these in order:

Is profiling enabled? Toggle must be ON in Settings.
Is the page whitelisted? Only pages in “Pages to Profile” are tracked.
Sample rate too low? At 25%, only 1 in 4 requests profile. Set to 100% for testing.
Threshold too high? Set to 0ms temporarily to capture all hooks.
Are you visiting the right page? Make sure it’s in your whitelist.

Why is the plugin breakdown empty?

Enable “Identify plugin sources” in Settings. Without this, hooks are captured but not attributed to specific plugins.

What does “unknown” plugin mean?

Appears when callbacks can’t be traced to source files. Common causes: anonymous closures, dynamically generated functions, or code outside plugin/theme directories.

Can I leave it running on production?

Yes, especially in Safe Mode. Sample rate ensures only 10-25% of requests are profiled, and overload protection prevents performance impact.

How long is data kept?

Default: 24 hours. Configurable from 1 hour to 7 days. Data is automatically cleaned up via WordPress cron.

Does it work with page caching?

The profiler measures uncached PHP execution. Cached pages bypass PHP entirely and won’t appear in profiles – this is expected behavior since cached pages are already optimized.

Can I use this on multisite?

Yes. Each site maintains its own profiling data. Network admins can access the dashboard on any site.

Reviews

There are no reviews for this plugin.

Contributors & Developers

“Speedix” is open source software. The following people have contributed to this plugin.

Wp Core Tools

“Speedix” has been translated into 1 locale. Thank you to the translators for their contributions.

Translate “Speedix” into your language.

Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.

Changelog

2.1.0

Added: Frontend timing tracking – measures FCP, LCP, DOM, and Load in the browser
Added: Frontend Timing enabled by default for new installations
Added: Desktop vs Mobile mini trend charts in Frontend Timing card
Added: Frontend Timing history modal showing all metrics (LCP, FCP, DOM, Load) over time
Added: Max values shown alongside averages on all timing charts and tooltips
Added: Per-page tabs now load data separately via AJAX (improved performance)
Added: Cache detection for frontend page loads (via Navigation Timing API)
Added: Inline scripts/styles tracking in Assets modal
Improved: Assets modal source detection for CDN-hosted local files
Fixed: Frontend timing card now correctly shows desktop values
Fixed: Clear Data now properly clears External API logs and Site Health scan results

2.0.4

Added: External APIs tab now shows source plugin badge for each HTTP call
Added: Source detection uses backtrace to identify which plugin initiated API requests
Improved: History chart icon grayed out for endpoints with insufficient data points (<3)
Improved: Tooltip explains “Not enough data for chart” when hovering inactive chart icons

2.0.3

Added: Response Time card now shows request count, P95 percentile, and Frontend/Admin split
Added: Time period indicator in Response Time card header
Added: Timeout alerts shown directly in Response Time card
Added: Clear “Site Health Scan” button restored to Health card
Improved: More actionable metrics at a glance

2.0.2

Redesigned: Dashboard top cards – clearer layout with better information hierarchy
New: Time Breakdown card shows PHP/DB/HTTP split with visual bars
New: Response Time card now shows trend comparison (faster/slower vs previous period)
New: Health card includes sparkline trend showing score changes over time
Improved: Cards always show useful data even without hook profiling enabled

2.0.1

Removed: Bundled translations – plugin is now English-only (reduces zip size by 40%)
Note: Technical terminology (hooks, profiler, threshold) doesn’t translate well; target audience is developers who work in English

2.0.0

Fixed: Setup wizard now applies all preset settings (track_incomplete, track_autoload_size, track_object_cache, track_slow_queries)
Fixed: Site Health modal auto-opens after wizard completion
Added: Data retention varies by preset – Safe: 12h, Balanced: 24h, Detailed: 48h
Added: Daily health email option in setup wizard (step 3)
Fixed: Site Health severity levels – bloated options and disabled OPcache now flagged as issues
Improved: Assets modal shows source location (plugin/theme/core/external) with copy option
Improved: User sessions display now shows user count alongside size
Improved: Input sanitization follows WordPress handbook (wp_unslash before sanitize)
Validated: All security checks pass, translations verified, WordPress.org ready

1.8.6

Added: Site Health Scan with 22 checks for database bloat, configuration issues, and performance problems
Added: PHP version check (warns if below 8.0)
Added: User sessions size check (detects wp_usermeta bloat)
Added: Action Scheduler history check (WooCommerce completed actions)
Added: Site Health Scan button on Health card for quick access
Added: Setup wizard now offers initial Site Health Scan on completion
Added: Email Report button – sends site health report to current user’s email
Added: Copy Report button – copy scan results to clipboard
Added: Daily automated site health email reports (configurable in settings)
Added: Mobile-responsive HTML email template for site health reports
Improved: OPcache check now shows memory usage, cached scripts count, and restart count vs limits
Improved: Passed items now collapsed in accordion to save screen space
Added: Output buffer size tracking (HTML output bloat detection)
Added: Memory limit percentage (how close to crashing)
Added: Included files count (PHP file loading overhead)
Added: Textdomain count (translation file loading overhead)
Added: CPU time tracking via getrusage() (CPU-bound vs I/O-bound)

1.8.4

Added: Asset Count toggle in settings to enable/disable JS/CSS tracking
Fixed: TypeError when asset source URL is null (inline scripts)
Fixed: JavaScript error on dashboard load (sectionCache undefined)
Fixed: Health score now calculated in JavaScript only (single source of truth)
Improved: Admin widget shows response time only (lighter, faster loading)
Removed: Graph icon from slowest hooks section

1.8.3

Added: WooCommerce checkout complexity metrics (payment gateways, shipping methods, coupons, session size)
Added: Clickable Assets stat opens modal showing all enqueued JS/CSS files with sizes
Improved: Autoload options modal shows “By Source” tab grouping options by plugin
Improved: Health score penalty for excessive assets (>25, >40, >60 files)

1.8.2

Added: Asset tracking – counts enqueued JS/CSS files per page
Added: Assets metric in System Status showing JS/CSS file counts

1.8.1

Added: OPcache status history tracking (hit rate, memory usage, script count)
Added: External API call logging with host/path breakdown
Added: Clickable API rows open history graph
Fixed: Dashboard shows average HTTP time per request

1.8.0

Added: WordPress admin dashboard widget with health score and slowest plugins
Added: Color-coded metrics based on performance thresholds
Fixed: Plugin Check warnings for direct database queries

1.7.3

Fixed: WooCommerce page timing cards now show response times
Optimized: Database schema reduced storage by ~70%
Improved: Faster queries with composite primary keys

1.7.2

Added: Incomplete request detection – tracks timed out or interrupted requests
Added: Warning indicator shown on pages with incomplete requests
Added: Responses data included in JSON/Markdown exports

1.7.0

Added: Smart calibration with Apply and Apply & Save buttons
Added: Calibration suggests sample rate based on hook count
Added: DB and HTTP time breakdown in Response Time card
Improved: Quick Presets in Sampling section
Improved: Response Time card centered layout

1.6.0

Changed: Dashboard is default view when opening plugin
Added: Copy to clipboard for hook names
Added: Plugin file path on hover over badges
Added: Dark mode support (follows system preference)
Fixed: All PHPCS security warnings

1.5.9

Fixed: By Hook tab shows each hook once (aggregates all plugins)
Fixed: Hotspots only shows hooks with avg >= 1ms
Improved: Cleaner hook list without duplicates

1.5.8

Improved: Simplified dashboard with 3 summary cards
Improved: Timeline uses 5-minute intervals
Improved: Only render active tab data
Added: Tooltip help icons on cards
Added: Overload Protection status in Settings

[See full changelog in plugin folder]