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What sort of high performance server is this? If it's virtualized rather than true dedicated, it wouldn't surprise me if the exact amount of available CPU varies dramatically from moment-to-moment even if the provider is guaranteeing some number of cores worth of overall performance.

Could be interesting to some time make a tool for measuring the stability of available CPU, based on running rapidly running a series of identical micro-benchmarks and looking at the variations in how long it takes.