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> I created a "large test suite" to be more intensive. On my dev machine it needed to run for 8 hours.

During such long and compute-intensive tests, how are thermal considerations mitigated? Not saying that this was case here, but I can see how after saturating all cores for 8 hours, the whole PC might get hot to the point CPU starts throttling, so when you reboot to next OS or start another batch, overall performance could be a bit lower.

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having recently done similar day-and-night long suites of benchmarks (on a laptop in heat dissipation conditions worse than on any decent desktop), I've found that there is no correlation between the order the benchmarks are run in and their performance (or energy consumption!). i would therefore assume that a non-overclocked processor would not exhibit the patterns you are thinking of here

8 hours should be enough to let the temperatures settle

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