{
  "pack": "zeus-performance-100y-v2",
  "version": "1.0.0",
  "freezeDate": "2026-05-06",
  "nextReviewYear": 2031,
  "horizonYear": 2076,
  "provenanceRoot": "3911a0aef0d5ffa0cd7796c7931f8353bbffcce845ae09a155e4c4a55ed1f8e2",
  "owner": {
    "name": "Vladoi Ionut",
    "email": "vladoi_ionut@yahoo.com",
    "btc": "bc1q4f7e66z87mdfj56kz0dj5hvcnpmh0qh4wuv22e"
  },
  "timestamp": "2026-06-10T18:21:14.729Z",
  "title": "Energy-per-Interaction (EPI) — A New Web Performance Metric",
  "purpose": "A brand-new public metric: joules consumed per user interaction (click, tap, key). Paired with INP, it measures both speed AND sustainability.",
  "units": {
    "energy": "mJ",
    "power": "mW"
  },
  "targets": {
    "p75_mJ": 50,
    "p99_mJ": 200,
    "hardCap_mJ": 500
  },
  "methodology": [
    "Sample wall-clock ms × measured CPU package power (when battery API available) per interaction.",
    "Fallback estimator: 0.4 J per ms of long task on a reference device class.",
    "Aggregate per-route via signed weekly attestations."
  ],
  "crossLinks": [
    "/api/v100/perf/zero-energy-pledge",
    "/api/v100/carbon-budget"
  ],
  "pledge": "Halve EPI by 2030, halve again by 2040, target carbon-negative interactions by 2076."
}