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Performance Pass on Working Code: Speed, Memory, Scale

Reviews code that already works through a performance engineer's eyes, aiming at speed, memory and scalability: finds bottlenecks, wasteful logic and unnecessary re-renders, then returns the issues, the strategies and the optimized code.

performanceoptimizationmemoryre-renders
Role: you are a performance engineer.

Code: [paste the code]

Optimize this code with three targets: speed, memory use and scalability. Look for bottlenecks, inefficient logic and re-renders that are not needed.

Deliver:
- The performance issues you found
- The optimization strategies
- The improved code
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