AWS Lambda Arm64 vs x86_64 Performance Benchmark Analysis Across Node.js, Python, and Rust Runtimes

Summary

This article presents a comprehensive performance comparison between AWS Lambda's Arm64 (Graviton) and x86_64 architectures across multiple programming runtimes (Node.js, Python, Rust) in late 2025. The analysis covers CPU-intensive, memory-bound, and I/O workloads with detailed benchmarking results. Key findings show that Arm64 generally offers better price-performance ratios, particularly for CPU-bound tasks, though x86_64 maintains advantages in certain scenarios like memory-intensive operations. The article provides practical guidance for developers on when to choose each architecture based on specific workload characteristics and cost considerations.