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Comparing AWS Lambda ARM64 vs. x86_64 Performance Across Runtimes in Late 2025(chrisebert.net)
38 points by hasanhaja 3 hours ago | 3 comments
  • ju-st2 hours ago

    Would be interesting to add a cold start + "import boto3" benchmark for Python as importing boto3 takes forever on lambdas with little memory. For this scenario I only know this benchmark but it is from 2021 https://github.com/MauriceBrg/aws-blog.de-projects/tree/mast...

  • tybit2 hours ago

    It’s interesting that the author chose to use SHA256 hashing for the CPU intensive workload. Given they run on hardware acceleration using AES NI, I wonder how generally applicable it is. Still interesting either way though, especially since there were reports of earlier Graviton (pre v3) instances having mediocre AES NI performance.

  • KeplerBoy20 minutes ago

    > Node.js: Node.js 22 on arm64 was consistently faster than Node.js 20 on x86_64. There's essentially a “free” ~15-20% speedup just by switching architectures!

    Not sure why this is phrased like that in the TL;DR, when ARM64 is just strictly faster when running the same nodejs workload and version.