However, the precompiled versions now requires a commercial license and there are other solutions.
Ghostscript
Capable of producing much lighter PDF files.
The basic principles involve converting your web page into a PostScript format using html2ps and then running it through Ghostscript to produce the PDF making use of the system() function.
+PDML is built on top of FPDF, and is licensed under the GPL. It's a markup language ( similar to HTML ) parsed in PHP to dynamically create some PDF files.