as knoppix is made to run from CD or DVD it would be hard to save anything, if you use a HDD install of Debian or kubuntu instead some of the configuration is saved and you can tweak things to boot into desktop in under 40seconds.

if you really know what you are doing with both hardware and software (including messing with C source-code and Linux kernels) I know that five seconds (yes 5 seconds) to fully boot with desktop up and running is possible with Linux.
but as I said this requires quite intimate knowledge, well beyond 95% of users.
if you want a demonstration search for "5 second Linux boot" on youtube.