I´ve been searching in the forum, but believe me, i didnt found the answer for my problem yet:

1) when running a level with just a ball and a camera, in fullscreen mode, and apply a force to the ball (phent_addcentralforce), the movement / displacement its not smooth. It seems the last frame of the ball movement its always visible. (the problem occurs in Techdemo camera movement also);

2) in fullscreen mode, the FPS [F11] dont exceed the monitor refresh rate (max refresh rate at 1280x1024 its 72 hz);

3) in window mode, the FPS its better (120 or more), however, its almost impossible play the game, because theres nothing smooth in that level;

4) with 70hz refresh rate, i obtain the best results, however still happens those "frames" or "jerks" in the game;

5) i made a test: with another monitor (Samtron CRT 75E), the problem its the same;

6) My system:
Athlon 1.15 GHZ
512 MB RAM
3dCard: Asus v9570 TD 128 MB Geforce fx 5700, BIOS: 4.36.20.21.00, updated drivers
Monitor: TFT Samsung synchmaster 172s, updated drivers
Directx 9.0c, dxdiag-directDraw test=OK, direct3D=OK
3dgs a6

7) well, sorry my english...but i need some help...thanks.