[okrasz]

This is not fully correct. It is correct that the CPU time has be been stolen, BUT nobody told that you will be the only one who will be getting a physical CPU. AWS gives you specific part of CPU and the one that is not committed to your server is seen as seal time. This is normal. Note that the seal time stays on virtually constant level. Even if your neighbor wasn't busy you would still not get additional CPU as AWS does not allow CPU bursting (using unused CPU) to other instance types than Micro, which I've read is actually running on second priority on otherwise unused CPU cycles.