Updating translucent forms, very slow

Question

I have a Windows form, I call the method DrawToBitmap on the form. I altered the bitmap with some drawing objects.


I now want to overlay this bitmap with transparent parts over my form. Unfortunately my form contains some controls, which do not seem to want to get overlaid. the axbouser.


unFortunately, the only way I can do this is to have a semitransparent second form and place my bitmap as a background image. This method works very well with the exception It is incredibly slow.

Does anyone know how to draw my image over my form without the need to use resource intensive translucent forms?