(was for a specific game forum but sharing here might be interesting) ok so on my machine i tested the same scenario - Boot the game, - select a porsche in the menus, - select bathurst in the menus, - set a mode with no other vehicles (so cannot affect load times) - time it till i can drive the vehicle away. All games installed on same NVME / Samsung 980 evo. All games loading to triple screen, only middle screen recorded. I used OBS studio and an OBS based timer (it cannot be messed with its baked into the video) (going from slowest to fastest below) R3E ~ 198s to track iRacing ~107s to track rF2 ~93s to track AMS2 ~69s to track ACC ~48s to track AC ~38s to track.
If I remember ACC was always instantly for me. You press go/start and poof you're ingame. Just like in your video. <3 Maybe a bit faster.
im a casual gamer aand i dont have a heap of time to "git er dun" so most evenings ill hop on for a few laps and i gravitate to whatever gets me going first.