Every game spawns and despawns stuff on the fly. And really, gta v did not shine when it came to npcs and cars density. It was actually quite underwhelming, gta iv did much better, specially on PC. But it also ran like shit on consoles.I saw a guy showing the 'performance improvements' with his 5950X + a 3090 and it was getting around 40FPS when driving around the lifeless city that is Night City.
What a total joke when you've got games like GTA V that has a decent population in the city with details and actual simulated weather systems that affect all the drivable vehicles in the game including wind simulation for all the aircraft.
Meanwhile Cryberwank 2069 can barely run basic NPC & traffic without having to despawn them when you look aware for a second.