What tatu said is correct - CE increases the triangle limit per-mesh to a tested limit of 3071 (possibly more - up to 4096, perhaps?), but the game engine has a limit to how many faces can be loaded in the level overall per-mesh. I hit this limit with my RTJP~Helipad level, which resulted in the level crashing during load. Luckily Lee Arbuco managed to update CE for me to get around this problem, but the per-mesh limit of 3071 is still enforced, and you should be wary when increasing the maximum overall polygons in the level using the CE .ini tweak as values too high will probably make the engine unstable.
Trespasser ATX or retail with no mods has a poly limit of 2048 hardcoded. Break up your meshes into several smaller ones to get around this limit, but try to nonetheless you should try and keep polys-per-mesh low.
Remember that this is a game from 1998, and an unstable one at that.
Draconisaurus wrote:
It's important to still pay attention to the limits, both original and increased, so as to yield a level which will still run smoothly on computers.
Yes - you should also keep in mind that no matter how good your hardware might be, Trespasser's engine will always bottleneck your system. You can increase the amount of memory Tres is allowed to use by running the 4GB patcher on the .exe, but again this only goes so far.