Cloud Mercato tested CPU performance using a range of encryption speed tests:
Cloud Mercato's tested the I/O performance of this instance using a 100GB General Purpose SSD. Below are the results:
I/O rate testing is conducted with local and block storages attached to the instance. Cloud Mercato uses the well-known open-source tool FIO. To express IOPS the following parametersare used: 4K block, random access, no filesystem (except for write access with root volume and avoidance of cache and buffer.
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the m6a.large will undoubtedly give the best performance for your money compared to the other versions of the m-series instances.

the m6a.large is the least expensive instance from a workload completion standpoint.

The M7 instances have a slight speed advantage even though the overall specification is the same with 2vCPU and 8GB of memory.

Amazon EC2 M6a instances are powered by 3rd generation AMD EPYC processors and are an ideal fit for general purpose workloads.

The M7 instances have a slight speed advantage even though the overall specification is the same with 2vCPU and 8GB of memory.