API Call Deduplication & N+1 Detection

Finds and fixes N+1 / duplicate VTEX (and Shopify) API call patterns in Deco storefront section loaders — the #1 cause of slow SSR on e-commerce sites. These patterns reduced PDP API calls from 40+ to ~8 and PLP spurious calls from 15+ to near-zero on espacosmart-storefront.

When to Use This Skill

• Page loads are slow (SSR > 3s)
• Terminal logs show many sequential/parallel calls to the same endpoint, or duplicate search/{slug}/p calls for the same product
• VTEX returns 429 (Too Many Requests) errors
• Cross-selling endpoints (similars, suggestions, showtogether) are called multiple times with the same ID
• simulation POST is called once per product instead of batched
• PDP/PLP page load triggers 20+ VTEX API calls
• HAR analysis shows a waterfall of sequential API calls
• [CMS] Unhandled resolver: site/loaders/... warnings appear
• User reports "a troca de pagina ta demorando"
• After migrating loaders or adding new shelf/search sections

Workflow