Index LCP under 2.5s

What TestSprite reads

The testing agent reads this JSON, opens the deployed URL in headless Chromium, executes each action step, evaluates each assertion. Verdict: passed / failed / blocked / inconclusive.

{
  "projectId": "1ad26753-ee03-4689-8f0f-6fa5d67c5c72",
  "type": "frontend",
  "name": "Performance — index LCP under 2.0s on a slow connection",
  "description": "GET / Largest Contentful Paint should land under 2.0 seconds on a Lighthouse mobile profile (slow 4G). Failing this means the deployable is technically working but not shippable as a real product — degrades the side-metric for share-link clickthroughs.",
  "priority": "p1",
  "metadata": {
    "category": "performance",
    "stage": "all"
  },
  "planSteps": [
    {
      "type": "action",
      "description": "Open developer tools network panel set to Slow 4G profile"
    },
    {
      "type": "action",
      "description": "Navigate to the homepage"
    },
    {
      "type": "assertion",
      "description": "Verify the page's Largest Contentful Paint (LCP) reaches its painted state within 2.0 seconds of navigation start"
    },
    {
      "type": "assertion",
      "description": "Verify the bracket section's first match card is visible (not just present in DOM — actually painted) within 2.5 seconds of navigation start"
    }
  ]
}