How We Eliminated 90% of API Calls by Replacing Polling with SSE
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At PersonaCart, we run a creator commerce platform — 50+ pages, 14 languages, multi-tenant SaaS. Our dashboard, order managment, analytics, and notifications all needed real-time data. Like most teams, we started with the obvious approach... polling: setInterval(() => fetch("/api/orders").then(r => r.json()).then(setOrders), 30000); Six pages polling every 30 seconds. Per user. Always. Even when literally nothing changed. The math was ugly: 6 pages × 2 API calls each × 30s = 12 request