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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While the chart above is a good start, there’s more than simply considering “Reserved vs. On Demand”. So let’s take a closer look at all the options…

The similar Compute Optimized c4.large has half the memory (3.75GB), and also costs $0.10 / hr. According to the docs, M4 runs at 2.4GHz and C4 at 2.9GHz, so the C4 is a 21% faster. They have similar Intel processors and features. If your job is CPU intensive then the C4 will probably be approximately 20% faster.

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

The similar Compute Optimized c4.large has half the memory (3.75GB), and also costs $0.10 / hr. According to the docs, M4 runs at 2.4GHz and C4 at 2.9GHz, so the C4 is a 21% faster. They have similar Intel processors and features. If your job is CPU intensive then the C4 will probably be approximately 20% faster.

The similar Compute Optimized c4.large has half the memory (3.75GB), and also costs $0.10 / hr. According to the docs, M4 runs at 2.4GHz and C4 at 2.9GHz, so the C4 is a 21% faster. They have similar Intel processors and features. If your job is CPU intensive then the C4 will probably be approximately 20% faster.