/optimize

Analyze the selected code for performance issues and suggest optimizations.

Check for:

• Algorithmic complexity — O(n²) loops that could be O(n), redundant iterations
• Unnecessary work — repeated computations, missing memoization, eager loading
• Memory pressure — large allocations, leaks, excessive cloning/copying
• I/O inefficiency — N+1 queries, missing batching, unneeded network calls
• React-specific — missing keys, unnecessary re-renders, expensive operations in render

For each issue: describe the problem, explain the impact, and show the optimized version. Quantify improvements where possible (e.g., "O(n²) → O(n)"). Only suggest changes with meaningful impact — don't micro-optimize.