Xvesa Problem in ARCOS/9 GMA500

[eziodef]

The TinyCore is the standard installation, with standard extension (Xvesa).
The Xvesa not work fine.  The refresh is very slow.  The windows and mouse cursor are not painted correctly. But the driver XVesa work fine, because if I exit to the prompt and type Xvesa, I see the correct movment of the mouse cursor.
The Archos 9 have the GMA500 video card.