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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I am running a network-intensive task that sends several thousand pings/traceroute packets per second to external IP addresses. I've noticed that the network throughput is high soon after creating the instance, but drops off exponentially after the ping process has been running for more than an hour or so. I've tried this on a variety of instance sizes. Even on a c6.2xlarge (whose stated baseline network bandwidth is 2.5 Gbps), it drops down to around 200 packets a minute. Any ideas why this might be happening? Is there any way I can reserve more bandwidth for my instance?

I am just now trying to change the instance type and it's only letting me use the c6i platform - I was HOPING I could go to the c7g platform actually as the performance vs cost is stellar.

Ah, I'm having the same problem! Which C series did you pick?