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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In this we have observed that there is no much difference between gp3, io1 and io2 EBS volume types in c6in.xlarge instance and little difference in c6in.2xlarge instance. But instance point of view still it is higher read time in c6in.2xlarge compared to c6in.xlarge instance.

When we are trying to compare read time in c6in.xlarge and c6in.2xlarge instances, we have observed that read time is higher in c6in.2xlarge instance.
Consider these: