"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

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.