Performance Optimization

使用场景

• Analyzing algorithmic complexity and suggesting improvements
• Optimizing database queries and indexing
• Reducing frontend bundle size and load times
• Implementing caching strategies (Redis, CDN, memoization)
• Identifying memory leaks and excessive allocations

Analyze this code for performance issues and suggest optimizations.

Context:
- Current performance: [describe metrics, e.g., "API responds in 2s, target is 200ms"]
- Scale: [e.g., "10k requests/min", "1M rows in table"]
- Constraints: [e.g., "cannot change the database schema", "must support IE11"]

Code:
```
[paste code here]
```

Please provide:
1. Identified bottlenecks with complexity analysis
2. Prioritized optimization suggestions (highest impact first)
3. Optimized code with before/after comparison
4. Measurement approach to verify improvements
5. Trade-offs of each optimization (memory vs speed, complexity vs performance)

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