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Get Started Free →Component composition, hooks discipline and render-cost review for React 19: when to reach for a server component, why a context provider re-renders more than you expect, and how to read a Profiler flame chart before reaching for memo.
| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-19 | ✗→✓ | ▲ Improved | 15% | 0% |
| case-01 | ✓→✓ | ＝ Same ✓ | 10% | 0% |
| case-03 | ✓→✓ | ＝ Same ✓ | 8% | 0% |
| case-04 | ✓→✓ | ＝ Same ✓ | 22% | 0% |
| case-05 | ✓→✓ | ＝ Same ✓ | 4% | 0% |
Component composition, hooks discipline and render-cost review for React 19: when to reach for a server component, why a context provider re-renders more than you expect, and how to read a Profiler flame chart before reaching for memo.
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