Why the same machine gives different numbers each run
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If you run the same benchmark twice and get different answers, nothing is broken.
The usual causes, roughly in order:
- Heat. Laptops especially will slow themselves down after sustained load. A second run often lands lower than the first purely for this reason.
- Other software. A browser with many tabs, or anything using the GPU, competes for exactly the resource that limits generation speed.
- Cold vs warm model. The first run after loading includes work that later runs skip.
This is why comparisons should be run alternating — A, B, A, B — rather than all of A then all of B. Otherwise you're partly measuring how warm the machine got.
If your numbers swing by more than about 20% with nothing else running, that's worth posting about.
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