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Analyze web and backend performance using Web Vitals, network timing, and Node.js metrics. Use when the user asks about page performance, load times, Core Web Vitals (LCP, CLS, INP), slow pages, backend bottlenecks, or SEO performance factors.
Codex 또는 Claude로 설치 이 Prompt를 복사해 Codex, Claude 또는 다른 어시스턴트에 붙여 넣으면 Skill 페이지를 검토하고 설치를 진행할 수 있습니다.
SOC 직업 분류 기준
| name | performance-audit |
| description | Analyze web and backend performance using Web Vitals, network timing, and Node.js metrics. Use when the user asks about page performance, load times, Core Web Vitals (LCP, CLS, INP), slow pages, backend bottlenecks, or SEO performance factors. |
| allowed-tools | Bash(browser-devtools-cli:*), Bash(node-devtools-cli:*) |
Analyze web page performance using Web Vitals and network timing metrics.
This skill activates when:
browser-devtools-cli o11y get-web-vitals
browser-devtools-cli --json o11y get-web-vitals
browser-devtools-cli --json o11y get-web-vitals --wait-ms 3000
browser-devtools-cli --json o11y get-web-vitals --include-debug
browser-devtools-cli --json o11y get-http-requests
browser-devtools-cli --json o11y get-http-requests --resource-type script
browser-devtools-cli --json o11y get-http-requests --resource-type stylesheet
browser-devtools-cli --json o11y get-http-requests --status '{"min":400}'
browser-devtools-cli content take-screenshot --name "above-fold"
browser-devtools-cli content take-screenshot --name "full-page" --full-page
| Metric | Good | Needs Work | Poor |
|---|---|---|---|
| LCP | ≤2.5s | 2.5-4s | >4s |
| INP | ≤200ms | 200-500ms | >500ms |
| CLS | ≤0.1 | 0.1-0.25 | >0.25 |
| TTFB | ≤800ms | 800-1800ms | >1800ms |
| FCP | ≤1.8s | 1.8-3s | >3s |
SESSION="--session-id perf-audit"
# 1. Navigate to page
browser-devtools-cli $SESSION navigation go-to --url "https://example.com"
# 2. Wait for page to settle
browser-devtools-cli $SESSION sync wait-for-network-idle
# 3. Get Web Vitals
browser-devtools-cli $SESSION --json o11y get-web-vitals --wait-ms 2000
# 4. Analyze network requests
browser-devtools-cli $SESSION --json o11y get-http-requests
# 5. Check for console errors
browser-devtools-cli $SESSION --json o11y get-console-messages --type warning
# 6. Take screenshot for reference
browser-devtools-cli $SESSION content take-screenshot --name "performance-audit"
# 7. Cleanup
browser-devtools-cli session delete perf-audit
# Filter by type (one at a time: document, stylesheet, image, script, xhr, fetch, etc.)
browser-devtools-cli --json o11y get-http-requests --resource-type script
browser-devtools-cli --json o11y get-http-requests --resource-type stylesheet
browser-devtools-cli --json o11y get-http-requests --resource-type image
browser-devtools-cli --json o11y get-http-requests
# Look for requests with high timing values
When TTFB or API latency suggests backend bottlenecks, inspect the Node.js process:
# Connect to API/server process
node-devtools-cli --session-id perf debug connect --pid 12345
# Tracepoint on slow handler to capture call context
node-devtools-cli --session-id perf debug put-tracepoint \
--url-pattern "routes/heavy.ts" \
--line-number 30
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