For me its not a player created world. The ones I can't live without are Sunset Valley and Lucky Palms (store world). I know SV is probably cliche but even after all these years its my favorite and the one (besides LP) that runs the best with the least number of bugs and stuck sims. For the size of Lucky Palms, it runs very well on my old machine. (Not sure why but the game is still installed on my dinosaur computer rather than my new one) I guess they'd all run nicely like that if I'd just put them on this machine :/ It just doesn't feel right to play the game without that nostalgic lag! (I know it sounds like I'm being snarky but I'm serious!) It just didn't feel right playing the game without lag after playing on my crummy old machine for so many years :P