How can we explain the time around the Aliens?

I don't consider myself to be too bad on certain tracks, I feel like I'm at the limit of what the car can take, and yet some of the so-called "Aliens" still put seconds on me ...

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What makes it so good? Their practice time? Their equipment? Their car setup? Or just genetics?

Edit: I apologize in advance for the English mistakes, it's not my mother tongue, in the title it's not the era but their lap time.