nVidia recently released a whitepaper outlining the proper usage of vertex buffer objects in OpenGL. A vertex buffer object (VBO) is a powerful extension that allows programmers to store certain data in high-performance memory (AGP memory). This allows for significant perofrmance gain in contrast with typical vertex calls (glVertex3f).
The article can be found at: http://developer.nvidia.com/object/using_VBOs.html
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