[AzN1337c0d3r]

There's also the problem of Turbo Boost.

My laptop's 9980HK will boost to ~4.5 GHz when only loaded to a single core.

However, when I load up all 8 cores, it might only sustain ~3.5 GHz.

Therefore the 8 cores might not actually result in the work being completed 8 times as fast, only 6.2x (8*[3.5/4.5]) real-time due to the lowered clock rate of each individual core.

This will show up as additional user time, since each individual core is able to do less work for each unit of time (seconds) compared to the single-core case.