Speed of VBO, displaylists and vertex buffer

In my recently written terrain renderingProgramIt is found that using vertex buffer cannot increase the frame rate. Using VBO can indeed increase the frame rate by at least twice, but can display lists achieve the speed of VBO? My video card is NVIDIA geforce FX 5700le, and the video card driver 81. 98. However, we found that using displaylists can save half of the video memory compared with VBO through the NVIDIA gdebugger test. I went to gamedev and Google to search for discussions about VBO and displaylists and found many people come to the same conclusion. Isn't VBO really able to exert its more powerful power as we expected? Under research ......