LinkFreeze from Helicontech.com requires that HTML pages (including those generated by ASP, ASP.net, PHP, etc) be compressed after linkfreeze has been called. Applications such as SFCompress actually compress the page during compilation thus compressing the content before LinkFreeze can work. Additionally, all of our windows 2003 based hosting servers already have HTTP compression enabled so these compression tools provide only marginal gains above that already in place.
Content retrieved from: https://support.appliedi.net/kb/a373/are-there-any-linkfreeze-and-http-compression-tools-sfcompress-etc-incompatibilities.aspx.