The Hook: The Latency vs. Reliability Paradox In 2025, the "Serverless Cold Start" is still the primary villain of backend performance. You are likely facing a familiar dilemma: your Node.js Lambda functions or containerized microservices take 600ms–1.5s to boot, resulting in unacceptable P99 latency spikes. Bun enters the room claiming sub-50ms startup times, powered by JavaScriptCore and Zig. The benchmarks look incredible. Your CTO wants to switch immediately. However, you are hesitant. Node.js has 15 years of edge-case handling in V8 and libuv. Bun, while maturing, still exhibits unpredictable behavior with specific native bindings, subtle discrepancies in node:stream implementation, and occasional segmentation faults in long-running processes. You do not need to rewrite your infrastructure in Bun to solve cold starts. The solution isn't swapping runtimes; it's changing how you compile Node.js. The Why: Anatomy of a Cold Start To solve this, we must understand...
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