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jasonbutz.info · May 22, 2025

JavaScript Lambda Runtime Benchmarking

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Last month, I tried out using Bun as a custom JavaScript Lambda runtime and was surprised by the performance difference between Bun and AWS's managed Node.js runtime. The Node runtime had a shorter cold start time, and the invocations had a shorter duration. The cold start times weren't surprising given AWS's caching and performance optimizations, but the difference in the invocation durations was…

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