Comment Re:Irony (Score 4, Informative) 125
It must have been a very long time ago that you tried a private server, or you happened to pick a really crappy one that disabled LoS processing to save ram / cpu.
The "terrain" issues that you speak of are a lack of 3D data in the maps (vmaps). This problem has been solved for a long time. However (at least on Trinity and MaNGOS) you can disable vmaps processing on certain maps -- this will save you some memory and cpu usage. By default only map 369 (the deeprun tram) is ignored since it has no 3D data in the maps -- we aren't sure HOW blizz handles LoS (line of sight) issues on that map.
I would say that I am one of other scenarios