PSA: if having severe lag, disconnect the injury 500 tracks

FWIW, I just found 1 random former Krustyland parkgoer (not the new, tappable I&S ones) wandering around in my SH area, nowhere near the I&S entrance. I clicked on my old KL entrance once, but never actually placed it in SF. I did, however, place Sideshow You and the Viking Ride as well as a few KL tiles. Regardless of why I got that one random parkgoer, my game seems to be running fine, so it seems like your lag is probably caused by something else (possibly, as has been mentioned, the Injury 500 animation).