Just to give you one idea on how to cut down the size of the OCC libraries, I use TKernel.dll (Windows) as an example.
The original file was 2.3MB in size.
I changed to compiler to optimize for "Minimize size" instead of "Maximize speed" and the new dll file was 1.7MB in size.
That's half a meg for just one dll file.
And the difference in speed is pretty much the same.