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You can reserve entire machines, even using VPS. Heck, you can even luck out and be the first VPS on a newly provision host.

Chances of either, slim. Still I try not to assume when I don't have the data.

Sure you might but be sharing, but the point is that you don't generally have to care.

It's all virtualized and cloudy.

VPS performances wildly vary from provider to provider though.