The speed is at 1000-2000 fps now. The source is a bit longer but stayed around 200 lines for the main algo, which is easy to overview.
You can fetch the source code and executables here:
[-Download-ZIP-] (Textured Version older shader support, 32/64 bit) (Newest)
License is MIT
Space : wireframe view
Enter : Top-down view
Since there are many libs out there that have a completely bloated and unusable source code, I think its useful for everybody wanting to get started with terrain.