I´m working on a terrain generator but I have some questions, how many polygons a map can have without lagging and room inoff from another models in an average computer?, also if i set the INVISIBLE flag to a model,Are the model´s triangles still afecting the render process?,and lastly, is there anyway to render just a portion of the map?

1. An Invisible entity should not affect the grapical render process

2. A map can have really much polygons (some million)
textures, shaders and number of entities are affecting the game speed much more.

you could try it with 'regions', but I can't help you with this since I've never used this feature

thanks i´ll give it a try