there isn't any enforced or artificial slowdown of the printing process in the free edition.
Are you sure it is the actual printing which is slow? The conversion takes multiple steps of which printing is mainly outside of our control. We are using the same standard Postscript driver which is shipped with Windows. Is it faster if you leave PDFCreator running in the background? The initial launch might be slower as in very old versions which don't use the .NET Framework.