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9y old machines is what many people (not gamers, enthusiasts etc.) have; 3+ y old include underpowered Celeron 847, AMDs (way weaker than your monstrous Q6600) and even on these machines Flash works better. _My_ _actual_ observations.

> Still flash working better than HTML5 players is still suspicious to me,

Do you write programs for life or what? It is not a problem with HTML5 players, it a problem the way they are written. Flash is an older product, with better support of legacy or underpowered products.

> I still believe with correct configuration reverse should be true

Yes, the correct configuration is "more powerful CPU".