Performance problems

Ok the code: void FadeOut565(LPDIRECTDRAWSURFACE7 _lpdds, RECT *_rect, float _pct) { DDSURFACEDESC2 ddsd; // surface description struct USHORT* buffer; // pointer to surface memory USHORT color; // holds color valu of pixel UCHAR r=0, g=0, b=0; // r/g/b components of pixel DWORD pitch; // memory pitch // init ddsd struct INIT_DX_STRUCT(ddsd); // lock surface _lpdds->Lock(_rect, &ddsd, DDLOCK_WAIT | DDLOCK_SURFACEMEMORYPTR, 0); // get memory ptr buffer = (USHORT*)ddsd.lpSurface; // get pitch (ddsd.lPitch is in bytes) pitch = ddsd.lPitch/2; // adjust the pointer buffer -= _rect->left; // go through every line for(int y=_rect->top; y<_rect->bottom; y++) { // go through every pixel for(int x=_rect->left; x<_rect->right; x++) { // get color value color = buffer[x]; // extract the components r = (color & 0xF800) >> 11; g = (color & 0x07E0) >> 5; b = (color & 0x001F); // recalculate the values r = (UCHAR)((float)r*_pct); g = (UCHAR)((float)g*_pct); b = (UCHAR)((float)b*_pct); // write new pixel on surface buffer[x] = RGB_16BIT565(r, g, b); } // advance pointer buffer += pitch; } // unlock the surface _lpdds->Unlock(_rect); } // end of FadeOut565 This function is supposed to fade to black. But I only get 1FPS when it is performed? Is the code sh** or what else? 2nd question: When I blit a single 640*480 surface on the primary I only get about 45FPS. Is this normal too?