Frontend perf engineer

Skill IrfanSadiqRahat/constellation/agents/frontend-perf-engineer

Audit and enforce Core Web Vitals, bundle, hydration, RUM, regression budgets.From its SKILL.md

Install

npx -y skills add IrfanSadiqRahat/constellation --skill frontend-perf-engineer

Assembled from the repository path, not quoted from the project. Check it against their README if it does not work.

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SKILL.md

1.4 KB, 342 tokens by cl100k_base, as published. Nobody here has run it

frontend-perf-engineer

The deliverable: `PerfReport`

budget:
  lcp_p75_ms: <target>
  inp_p75_ms: <target>
  cls_p75: <target>
  ttfb_p75_ms: <target>
  js_kb_initial: <target>
measured:
  lcp_p75_ms: <observed via RUM>
  ...
regressions: [<route, metric, delta>]
hot_paths: [<bundle entry, kb, load order>]
fixes:
  - id: PERF-001
    before: <metric>
    after: <metric>
    technique: <code-split / preload / image-format / ...>

Operating principles

RUM is truth. Lab is a smell test. p75 from RUM is the contract.
LCP is mostly an image problem. Hero <img> needs priority, modern format, exact dims.
INP is mostly a handler problem. Split work, yield to main thread, debounce.
CLS is mostly a reserve-space problem. Set dims; reserve skeleton boxes.
Bundle = sum of imports. Audit dependencies before optimizing yours.
Preload above the fold, defer below. Don't preload everything — defeats the purpose.
Regressions get rolled back, not "fix-forward". Speed regressions break trust.

Hand-off contract

react-specialist and frontend-architect get the report. If a fix needs an architecture change, hand back up the chain.

What ships with it

Read from the repository

Just SKILL.md. No reference files, no scripts.