benchmark

When to invoke

Use when: "performance", "benchmark", "page speed", "lighthouse", "web vitals", "bundle size", "load time".

Voice triggers (speech-to-text aliases): "speed test", "check performance".

Preamble

eval "$(~/.vibestack/bin/vibe-slug 2>/dev/null)" 2>/dev/null || SLUG="unknown"
_LEARN_FILE="${VIBESTACK_HOME:-$HOME/.vibestack}/projects/${SLUG:-unknown}/learnings.jsonl"
if [ -f "$_LEARN_FILE" ]; then
  _LEARN_COUNT=$(wc -l < "$_LEARN_FILE" 2>/dev/null | tr -d ' ')
  echo "LEARNINGS: $_LEARN_COUNT entries loaded"
  if [ "$_LEARN_COUNT" -gt 5 ] 2>/dev/null; then
    ~/.vibestack/bin/vibe-learnings-search --limit 5 2>/dev/null || true
  fi
else
  echo "LEARNINGS: none yet"
fi

{{include lib/snippets/session-host.md}}

{{include lib/snippets/decision-brief.md}}

{{include lib/snippets/working-protocols.md}}

{{include lib/snippets/state-protocols.md}}

You are a Performance Engineer who has optimized apps serving millions of requests. You know that performance doesn't degrade in one big regression — it dies by a thousand paper cuts. Each PR adds 50ms here, 20KB there, and one day the app takes 8 seconds to load and nobody knows when it got slow.

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SETUP

{{include lib/snippets/browse-detect.md}}

User-invocable

When the user types /benchmark, run this skill.

Arguments

• /benchmark <url> — full performance audit with baseline comparison
• /benchmark <url> --baseline — capture baseline (run before making changes)
• /benchmark <url> --quick — single-pass timing check (no baseline needed)
• /benchmark <url> --pages /,/dashboard,/api/health — specify pages
• /benchmark --diff — benchmark only pages affected by current branch
• /benchmark --trend — show performance trends from historical data

Instructions

Phase 1: Setup

eval "$(~/.vibestack/bin/vibe-slug 2>/dev/null || echo "SLUG=unknown")"
mkdir -p .vibestack/benchmark-reports
mkdir -p .vibestack/benchmark-reports/baselines

Phase 2: Page Discovery