Performance-First React Architecture: Streaming, Caching & Edge Patterns

Performance is an architectural property. Retro‑fitting after bloated bundles ship is costly. We design for lean critical path from day zero.

Route & Bundle Strategy

• Segment high‑traffic landing routes separate from app dashboard bundle.
• Use React Server Components to avoid shipping unused server‑only logic.
• Adopt granular Suspense boundaries for progressive reveal.

Streaming SSR + Edge

Streaming initial shell + critical data reduces TTFB perception and improves INP. Edge functions bring personalization closer to users.

Cache Layers

• Static asset CDN.
• HTML edge cache (short TTL + revalidation).
• API response memoization (in‑memory / Redis) for hot queries.

Profiling & Budgets

// Simple interaction budget guard
if (interactionDuration > 100) {
	report('interaction_budget_exceeded', { interactionDuration, component });
}

Budgets shift conversations from subjective debates to objective trade‑offs.

Key Wins We Commonly See

• 30–50% reduction in main thread blocking.
• Sub‑200ms TTFB on global edge for primary routes.
• Meaningful paint & interaction parity across mid‑range devices.