I bump the thread, it's an awesome idea. It should at least be an option for those with better system specs...would be so awesome it would make people upgrade their PCs
I was thinking there could be NPC cars spawning just near the car, and no more than 3 total spawned vehicles at a time. And yeah there could be a physics sleep too like randomshortguy said. --- Post updated --- Yay, then I can play at 1080p well.
And it only took three years :X It was actually a mod made official, though. It wasn't supposed to come yet, but someone made it real anyway!