500-item catalog was making 50 sequential API calls, causing progressive rate-limit
throttling (explains "super slow towards the end") and ~$3 in credits.
- BatchSize: 10 → 25 (word limits are in place; 25 items × ~80 tokens ≈ 2000
output tokens, well within MaxTokens=8192 — the original truncation cause)
- Run up to 3 batches concurrently via SemaphoreSlim(3) — independent API calls
with no shared state, so no growing context issue
- For a 500-item catalog: 50 sequential calls → 20 calls in ~7 parallel waves,
roughly 4× faster and 60% cheaper
- Dropped unused `costs` param from AnalyzeBatchAsync (system prompt has all costs)
- JS progress timing updated to reflect parallel waves
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
spouliot
19cc03ad1c