Philips Pronto TS1000 - Manual (Page 57)

compress any of a CCF's bitmaps. With "CCF Optimizer", you can compress each and every bitmap in
your file. While this has the benefit of increasing available free memory, the downside is that it takes
longer for the Pronto to decompress the images before displaying them, adding noticable delays to
each page switch.
RC: Philips Pronto & Marantz RC5000 Unofficial FAQ 57