subinium Perf Triage
Quick performance triage with delegation to perf-researcher agent for deep analysis. Read-only — never modifies code.
Arguments
Parse $ARGUMENTS:
--bundle— bundle size analysis only--build— build time profiling only--lighthouse— Lighthouse CI run only (requires running dev server or live URL)--all(default) — bundle + build + lighthouse in parallel
Process
1. Detect project type
[ -f next.config.js ] || [ -f next.config.mjs ] || [ -f next.config.ts ] && echo "nextjs"
[ -f vite.config.js ] || [ -f vite.config.ts ] && echo "vite"
[ -f astro.config.mjs ] && echo "astro"
[ -f remix.config.js ] && echo "remix"
2. Run measurements (parallel Bash calls in single message)
Bundle (Next.js):
ANALYZE=true npm run build 2>&1 | tail -80
du -sh .next/static .next/standalone .next/server 2>/dev/null
find .next/static/chunks -name "*.js" -size +200k 2>/dev/null | head -10
Build profile:
{ time npm run build; } 2>&1 | tail -30
Lighthouse:
# Prefer LHCI if configured
if [ -f lighthouserc.* ] || [ -f .lighthouserc.* ]; then
npx --no-install lhci autorun 2>&1 | tail -40
else
# Fall back to single run against localhost:3000
npx --no-install lighthouse http://localhost:3000 \
--output=json --output-path=/tmp/lh.json --quiet 2>&1
jq '.categories | to_entries | map({(.key): .value.score}) | add' /tmp/lh.json 2>/dev/null
fi
3. Quick verdict
Surface ONLY red flags (suppress noise):
| Metric | Threshold |
|---|---|
| Main JS chunk | > 250 KB gzip |
| Total JS bundle | > 1 MB |
| Build time | > 60s |
| Lighthouse Perf | < 70 |
| LCP | > 2.5s |
| CLS | > 0.1 |
| INP (replaces FID 2024+) | > 200ms |
4. Delegate to perf-researcher
If any red flag triggered, dispatch via Task(subagent_type='perf-researcher', ...) with:
- The metric that failed
- The hot file paths from bundle analyzer
- A scoped optimization request (don't ask for "everything" — pick the worst metric)
Output
## Perf Triage — YYYY-MM-DD
### Measurements
| Metric | Value | Threshold | Status |
|---|---|---|---|
| Main JS chunk | 312 KB gz | < 250 KB | RED |
| Build time | 47s | < 60s | OK |
| Lighthouse Perf | 82 | > 70 | OK |
### Red Flags
- Main JS chunk over budget by 25%
- (none) for others
### Delegated
Dispatched to `perf-researcher` for: main chunk root cause + reduction plan
### Quick Wins (safe to do without further analysis)
1. Remove unused `lodash` full import — switch to `lodash-es/specific`
2. Lazy-load chart library on dashboard route only
Constraints
- Don't modify code — measurement and delegation only.
- ALWAYS run measurements in parallel, never sequential.
- Korean response per global CLAUDE.md.
- If no project type detected, ask the user — don't guess.