Martin Graesslin's bootup contribution
A lot of work has been put into making KDE log in faster, from all portions of the community it seems.
I can speak to this first hand. Moving from KDE 4.8.x to the 4.9 series was night and day in terms of boot up times. I'm glad that there's still continued work going into this effort.
Despite SSD instead of Harddrive
I have a Samsung 256 GByte SSD and under Windows I see many times the laptop is simply doing nothing, this happens under Linux too. I still wonder what the laptop is doing in these cases. The SSD can transfer upto 500MByte/s. Are there artificial slow downs? Is a program halting the computer for a while? I understand many little files have to be loaded during bootup. But the SSD light is not active so the SSD is simply waiting for the laptop. A faster CPU does not matter I think. :(
At average it takes 13 seconds to boot up fully to desktop from cold boot with automatic login. (After using Samsung magician and little overprovisioning...) But after this when the desktop shows up the observed behaviour is seen.