Found the doc that i used when writing my terrain renderer; http://www.flipcode.com/articles/article_geomipmaps.pdf
Man, what is that? I can't understand even a word. :roll:

Seeing the code, this is the only render call i found:

glDrawElements(GL_TRIANGLE_STRIP, FIndices.Count, GL_UNSIGNED_INT, FIndices.List);

So it is no wonder it gets slow... You couldn't edit world like 2000x2000 with system like this, view must be restricted some way.
You mean using f.i. octree? I've seen somewhere few Delphi implementations. Maybe I should try it? What do you think?