benchmark

name	benchmark
description	Performance baseline measurement. Captures page load times, Core Web Vitals, and resource sizes. Compare before/after on every PR.
used_by	["qa-engineer","release-engineer"]

Benchmark Skill

Load skills/public/browse/SKILL.md for browser commands.

Capture Baseline

Run on each key page:

const page = await browser.newPage();
await page.goto(url, { waitUntil: 'networkidle' });

const timing = await page.evaluate(() => {
  const nav = performance.getEntriesByType('navigation')[0];
  return {
    ttfb: nav.responseStart - nav.requestStart,
    domContentLoaded: nav.domContentLoadedEventEnd - nav.startTime,
    load: nav.loadEventEnd - nav.startTime,
    domInteractive: nav.domInteractive - nav.startTime,
  };
});

const resources = await page.evaluate(() => {
  return performance.getEntriesByType('resource').map(r => ({
    name: r.name.split('/').pop(),
    type: r.initiatorType,
    size: r.transferSize,
    duration: r.duration
  }));
});

Pages to Benchmark

• / (homepage)
• /[DOMAIN_ENTITY_PLURAL] (listing page)
• /login
• /profile (if authenticated)

Report Format

Save to docs/BENCHMARK.md:

Performance Benchmark — [date]

| Page | TTFB | DOM Content Loaded | Full Load | Resources | Total Size |
|------|------|-------------------|-----------|-----------|------------|
| /    | Xms  | Xms               | Xms       | N         | X KB       |

Comparison to Previous

| Metric | Previous | Current | Delta | Status |
|--------|----------|---------|-------|--------|

Delta > 20% regression → flag to CEO.