Playwright PHP - Performance

The Performance package helps you inspect how a page behaves in a real browser by extracting Core Web Vitals and network timing data with a single API.

Features

• Capture all Core Web Vitals directly from the browser with resilient fallbacks:
  • LCP (Largest Contentful Paint) - Loading performance
  • FCP (First Contentful Paint) - Initial render timing
  • CLS (Cumulative Layout Shift) - Visual stability
  • INP (Interaction to Next Paint) - Responsiveness (Core Web Vital as of 2024)
  • FID (First Input Delay) - Input responsiveness
  • TTFB (Time to First Byte) - Server response time
  • TBT (Total Blocking Time) - Main thread blocking
• Collect resource timing entries and expose them as value objects for downstream analysis.

Getting Started

Installation

composer require --dev playwright-php/performance

Usage

use Playwright\Performance\Monitor\PerformanceMonitor;
use Playwright\Playwright;

$browser = Playwright::chromium();
$page = $browser->newPage();

$monitor = new PerformanceMonitor($page);
$monitor->navigate('https://example.com');

$resources = $monitor->collectResourceMetrics();

// Core Web Vitals
$vitals = $monitor->collectCoreWebVitals();

// Resource Metrics
$resources = $monitor->collectResourceMetrics();

$browser->close();

Core Web Vitals

// ...
// $vitals = $monitor->collectCoreWebVitals();

echo $vitals->lcp;   // Largest Contentful Paint (ms)
echo $vitals->fcp;   // First Contentful Paint (ms)
echo $vitals->cls;   // Cumulative Layout Shift
echo $vitals->inp;   // Interaction to Next Paint (ms)
echo $vitals->fid;   // First Input Delay
echo $vitals->ttfb;  // Time to First Byte (ms)
echo $vitals->tbt;   // Total Blocking Time (ms)

Resources Loaded

// ...
// $resources = $monitor->collectResourceMetrics();

foreach ($resources as $resource) {
    echo $resource->toArray();
}

Format Results

use Playwright\Performance\Reporter\JsonReporter;
use Playwright\Performance\Reporter\MarkdownReporter;

// ...
// $resources = $monitor->collectResourceMetrics();

// JSON (default)
$reporter = new JsonReporter();
file_put_contents('report.json', $reporter->generate($vitals, $resources));

// Markdown
$reporter = new MarkdownReporter();
file_put_contents('report.md', $reporter->generate($vitals, $resources));

Testing

Use MockPerformanceMonitor to test your code without launching a browser:

use Playwright\Performance\Monitor\MockPerformanceMonitor;
use Playwright\Performance\Metrics\CoreWebVitals;

class MyServiceTest extends TestCase
{
    public function testPerformanceCheck(): void
    {
        $mock = new MockPerformanceMonitor();

        // Define expected values (optional)
        $mock->setCoreWebVitals(new CoreWebVitals(100.0, 50.0, 0.01, 0.0, 0.0, 80.0, 0.0));
        $service = new MyService($mock);
        
        // No real browser is launched here
        $service->analyzePerformance('https://example.com');
    }
}

The package also includes a PHPUnit trait with performance assertions. See the full documentation for details.

License

This package is released by the Playwright PHP project under the MIT License. See the LICENSE file for details.