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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This article provides information on EC2 Reserved Instances, including terms, payment options, scope, and offering classes.

I am not sure how to put in some intelligence into my terraform scripts, so that I get to choose only the instance type which is available for an AMI