The system setup of old devices was quite different from what we're used to now. CRT TV's, no OS in the way. Just inputs and near instant display of what was go

The system setup of old devices was quite different from what we're used to now. CRT TV's, no OS in the way. Just inputs and near instant display of what was going on. The more modern your game system gets, the harder it is to perform runahead. But it's also required less and less. Newer consoles got more 'laggy' by default, with OSes, USB/Bluetooth input processing, triple buffering and so on. So runahead requirements have become less and less to recreate experiences. As to you examples, the PS3 was meant to be played on LCD TVs much like our current setups. I don't know how RPCS3 compares to a real console, but I expect the difference isn't huge. Dolphin (GameCube) and Mupen (N64) can emulate their consoles so efficiently that you should be able to achieve 1 frame of runahead on somewhat powerful systems for many games.