Right, the more important number will be actually measuring the time you start from GRUB all the way upto post login into the usable desktop... there I feel KDE4 will have an advantage over GNOME, but KDE is RC and GNOME still has a chance to improve until distro releases in April...
BTW, the one you say "goes beyond 20 sec" is my dual core tablet with slow 5400 RPM HDD, if you see the thin vertical lines its at the 24 sec mark... The desktop stops at the 15 sec mark while the bootchart you posted with same CPU as mine stops at the 17 sec mark which is why I felt like bragging about being 2 sec or 10% faster
But anyways, point is, all distros will be working on this, not just Ubuntu, so next round of releases will be pretty cool...
BTW, the one you say "goes beyond 20 sec" is my dual core tablet with slow 5400 RPM HDD, if you see the thin vertical lines its at the 24 sec mark... The desktop stops at the 15 sec mark while the bootchart you posted with same CPU as mine stops at the 17 sec mark which is why I felt like bragging about being 2 sec or 10% faster

But anyways, point is, all distros will be working on this, not just Ubuntu, so next round of releases will be pretty cool...