We found 118 performance bugs across 2 PRs written with Claude Code

14 hours ago

Claude Code shipped two major features: Java language support and React framework support.
Codeflash identified 118 functions running up to 446x slower than necessary across two PRs.
Performance issues included inefficient algorithms, redundant computation, missing caching, and suboptimal data structures.
AI coding agents prioritize correctness over performance, leading to technical debt.
Optimization requires iterative benchmarking and system-level reasoning, which LLMs lack.
90% of AI-suggested code optimizations are incorrect or provide no real benefit.
Newer LLMs like Claude 4.6 Opus still struggle with performance optimization.
AI-generated code runs 2-5x slower, increasing compute costs.
52% of engineering leaders report performance problems due to increased AI usage.
Teams need to add a performance layer to their development workflow to address this issue.

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