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For comparison, here's an AWS a1.large instance (2cpus, 4GB ram) YABS benchmark I just ran

Jikes. Why is the hdd read so bad? 6 MB/s. Six?

4k block size, it's IOPS limited. No surprise there.

It's gated by the default IOPS limits, you'll note the larger block sizes have a considerably better throughput.

You can increase the IOPS, and thus the throughput for 4k operations, but at a cost, of course:

and an AWS c7g.large instance