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Perf

Static performance hints (large images, missing img dimensions, no loading=lazy, sync script tags) plus optional Lighthouse JSON report ingestion that surfaces failing audits ranked by potential ms savings. Use when the user wants to audit web performance or process a Lighthouse report. Dragoon does NOT run Lighthouse itself - generate the report with `npx lighthouse <url> --output json --output-path lh.json` and pass --lighthouse. Run as `node ~/.claude/skills/dragoon/skills/perf/scripts/perf.js [--lighthouse path]`.

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/perf

Two halves: static hints from your codebase, and parsing of Lighthouse JSON reports.

When to use

  • The user wants to audit web performance
  • After running Lighthouse, to surface the most impactful audits
  • Before launch, to catch image and script issues early

Static rules

  • perf-001 large-image (>500KB) (medium)
  • perf-002 img-missing-dimensions causes CLS (low)
  • perf-003 img-without-loading-lazy below the fold (low)
  • perf-004 sync-script-tag blocks parsing (medium)

Lighthouse ingestion

npx lighthouse https://example.com --output json --output-path lh.json
dragoon perf --lighthouse lh.json

Output: scores per category, core web vitals (LCP/CLS/TBT/INP/FCP/SI), and the top 6 failing audits ranked by ms savings.

Run it

dragoon perf                                # static only
dragoon perf --lighthouse lh.json           # add lighthouse summary
dragoon perf --severity medium              # filter
dragoon perf --json                         # CI mode

Dragoon0x/dragoon-skills/tree/main/skills/perf commit 507515d0d1

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Frequently asked questions

npx skillmds@latest add dragoon0x/perf