I've been replaying a lot of Gamecube (emulated) games recently and its kindof shocking just how quick you can get into the game.
From hitting run Run to first Player Input is seconds in most cases. No console bootup, no system updates, no game patches, no agreeing to game EULA version 5.129912342, no denying the game access to online content on every third screen, etc.
I'm sure its loading slightly faster emulated, but 90% of it is just not having the junk that has accumulated over the last 20 years.