This mod improves FPS by reducing meshes in-game. There is no image quality impact associated with it.
The aim of this mod it to improve performance (FPS) without quality loss by optimizing large meshes used through out the game.
7. Framerate Tests
Oblivion
Leyawiin Mages Guild: 40FPS before, 53FPS after, difference of 13FPS.
Shivering Isles
Sheogorath's Palace (most FPS intense area I could find): 25FPS before, 53FPS after, difference of 28FPS.
Sheogorath's Palace (different location): 45FPS before, 78FPS after, difference of 33FPS.
The Missing Pauldron : 49FPS before, 56FPS after, difference of 7FPS.