bizarre cause of lag/freeze issue - 1st post updated 8/26/13

I was just having a look around AP re the whole closed-in hedge thing. I'm wondering if closed in areas can be a problem on any Lot or only certain ones?

For instance, in the AP public pool, there are areas shut off by mid-height walls. Would this cause a problem? Since it is a pool Lot, it obviously won't spawn any employees, but what about tourists, paparazzi, wild animals etc? Where do they get spawned?