Why can most computers run modern games really well but extremely stutter when emulating old games

Question

Why can most computers run games like RDR2, Cyberpunk, etc. Really fast but when emulating ps3/Xbox360 games it lags and can barely run it?

In: 690

Answer 1

Well, in the case of, say, Far Cry 3, it was never coded to run easily on the computer, and that can be attributed to mainly spaghetti code. Just publishers making a game for console, and pumping out the pc port quickly and leaving it. And emulation sometimes has to run a whole bunch of code to port it in real time to pc.