SLOW bitmap from Stream

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Hi,there
i 'm writing an application about bitmap displaying.But i find it
works not very well because of the terrorable performance .

here's my code

/// <summary>
/// Get BMP according to the FrameNumber,then display
/// </summary>
/// <param name="FrameNo"></param>
/// <param name="FandR_Flag">direction</param>
/// <returns></returns>
public Bitmap createImage(int FrameNo, int FandR_Flag)
{
string xustr;
byte[] xutest;
xustr = "CAM";

//find image,cost about 1ms
xutest = ri.Fun_GetSpeData(xustr, FrameNo, FandR_Flag);

//read byte[] into memostream,cost about 1ms
MemoryStream ms = new MemoryStream(xutest, 0, xutest.Length);

//here cost 423ms to construct an bmp, what happened
here?!!!!!!!!!!!!!!!!!!!!!!!!
Bitmap bmp = new Bitmap(ms);

xutest = null;
ms.Close();
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
return bmp;
}

Any suggestion?

Thanks in advance~

Regards,

Freesc
.

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