Synthetic benchmarks for JavaScript runtimes create misleading performance narratives. While Bun claims up to 52,000 requests per second (RPS) compared to Node.js's 14,000 RPS, real-world application tests show nearly identical performance across Bun, Deno, and Node.js, all handling around 12,000 RPS. This discrepancy arises because synthetic tests ignore critical application components like databases and business logic, which dominate execution time.

The true performance differences lie in cold starts and tooling. Bun exhibits significantly faster cold starts (8-15ms) compared to Deno (40-60ms) and Node.js (60-120ms), offering tangible benefits for serverless environments. Additionally, Bun's dependency installation speed, at 47 seconds for 1,847 packages, drastically outperforms npm (28 minutes) and pnpm (4 minutes), accelerating CI/CD pipelines and developer workflows.

While all three are considered "production-ready," Node.js remains the enterprise standard due to its 13 years of stability and extensive ecosystem. Bun, with fewer open issues and faster tooling, suits greenfield projects and developers prioritizing experience. Deno offers a security-first approach with its permission-based model, making it suitable for sensitive applications. The choice hinges on specific project needs rather than raw benchmark figures.