With T4g instances, customers can optimize for both higher performance and lower cost per vCPU. T4g instances deliver up to 40% better price performance over T3 instances for a large number of applications built on open-source software utilizing Linux distributions. T4g instances also deliver 40% higher peak performance than T3 instances, enabling customers to migrate production workloads to T4g instances more effectively.
"Users on Ubuntu 20.04 LTS (Focal) can take advantage of additional optimizations found on newer ARM-based processors. The large-system extensions (LSE) are enabled by using the included libc6-lse package, which can result in orders of magnitude performance improvements."
From https://ubuntu.com/blog/ubuntu-aws-graviton2
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