13.6Performance Tracking

Per-Command Timing

# Wrapper function that times each command
timed_pw() {
  local start=$(date +%s%N)
  playwright-cli "$@"
  local exit_code=$?
  local end=$(date +%s%N)
  local duration_ms=$(( (end - start) / 1000000 ))
  echo "[timing] playwright-cli $@ → ${duration_ms}ms (exit $exit_code)" >> timing.log
  return $exit_code
}

Trend Analysis

Track test durations over time to catch performance regressions:

{
  "date": "2026-07-09",
  "test": "checkout_flow",
  "duration_ms": 4500,
  "previous_avg_ms": 3200,
  "regression": true,
  "delta_pct": 40.6
}

Alert when a test consistently takes >50% longer than its rolling average.