Create a plugin that leverages a C or C++ library to perform all the image processing.
We all know GDI is fast, but not nearly as fast as some of the C libraries out there. It is also extremely buggy and doesn't do multi-threading particularly well.
There are a lot of options:
http://www.graphicsmagick.org/index.html
http://freeimage.sourceforge.net/
http://www.emgu.com/wiki/index.php/Main_Page
http://www.boost.org/doc/libs/1_43_0/libs/gil/doc/index.html
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Nathanael Jones
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Created FreeImageDecoder, FreeImageEncoder, FreeImageResizer, and FreeImageBuilder plugins