TiffbitmapDecoder is very slow

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C#

WPF

image

Bitmap

Hi,
I try to split a MultiTiff image into his single Frames. That works, but not very well. For example two 170kb (~400kb) images with 2 frames need round about 2 seconds and that's horrible slow. Anyone know how i can improve this?

private static TiffBitmapDecoder DecodeImage(Task task, string filename)
{
   Stream imageStreamSource = new FileStream(task.path + filename, FileMode.Open, FileAccess.Read);
   TiffBitmapDecoder decoder = new TiffBitmapDecoder(imageStreamSource, BitmapCreateOptions.IgnoreColorProfile,
   BitmapCacheOption.OnDemand);
   return decoder;
}