This is the system Apple used to test iPhone software in 2006

I see.

Although it’s not really a sensible comparison. That G3 Power PC processors were RISC, and have different advantages and drawbacks when compared to x86 and x86_64 processors. They’re two completely different animals. It’s also important to remember that every single program for those turn of the millennium Apple machines were tailored to fit the hardware and OS perfectly. Since apple only made very specific lines of hardware, they could afford to use very specific code optimizations, and they knew the limits of their hardware.