Eu acho que você está esperando muito ...
De link (junho de 2013):
To me, AWS is to performance, what Microsoft was to security (pre Bill Gate's Trustworthy Computing memo).
e
Not only is EC2 slow and expensive, it's getting worse as faster processors and hard drives come to market. The new EBS-only M3 generation didn't come close to closing the gap.
De link (jan. 2014):
Whether you are aware of Cloud performance issues like the “Noisy Neighbor” problem, the “Shared Virtual CPUs” problem, or the “throttled 1GB network” problem – Cloud performance issues are encountered by every user.
e
These new m3 instance types are their “Second Generation general-purpose EC2 instance type”. Amazon and Intel are marketing that these instances run the Intel Xeon E5-2670 Sandy Bridge or Ivy Bridge processors and have higher clock frequencies, significantly improved memory performance, and faster SSD storage, all with better and more consistent performance at a lower price.
But do the new m3 instances benchmark numbers match the hype?
Sadly, no.