This may mean that you need to upgrade to Netscape Communicator 4.0 or later, or Microsoft Internet Explorer 4.0 or later. Also, in your browser Preferences, enable JavaScript. This is without using subroutines, which can further increase the amount of space saved. Similar space savings can be expected for large Asian language fonts that utilize the CID-keyed font format.
Space is saved through a number of optimizations in the encoding method.
Yes, it is based on all of the same concepts for drawing paths and hinting, but allows a more compact encoding of the font data and procedures. Also, the format will be used for fonts embedded in printer ROMs for Level 3 printers containing PostScript software. An additional Zip compression is then applied, and the result is then stored in the PDF document file. The decision should not be based on the PostScript version number. The best way to check for CFF support is to see if the FontType 2 implicit resource is defined.