CPU architecture wise, you can see the difference between cluttered, old x86 and ARM or even RISC-V chips. They just run so much more efficient, as you can tell with your phone lasting a day or two, or apple silicon consuming a fraction for the same performance.
An example for the ancient backend would be the flight pathing system DAL. (Wendover video)
We have very beat up VW T5s at my company and sometimes I do exactly this to practice. I have no empathy left for these, I don’t feel bad for the gearbox. It surely will be the last thing to fail on these cars.