Is it faster on the M1 chip because they made a proper build for it compared to before on the M1 chip, or are they saying it's 50% faster on M1 than on other ha

Is it faster on the M1 chip because they made a proper build for it compared to before on the M1 chip, or are they saying it's 50% faster on M1 than on other hardware? Edit: Title is now edited from what it was, it included a statement about speedup I couldn't find explained the same in the post It contains this quote though > Our internal tests show a wide range of features running an average of 1.5X the speed of similarly configured previous generation systems. So I guess it's faster than on other systems, but still vague about compared to what.