Dedoimedo posted a short article benchmarking Ubuntu 11.04 Natty Narwhal boot time performance.

In my Natty review, I did mention that boot times seem to have changed considerably compared to previous versions of the distro. In other words, they got longer, which is kind of surprising as the desktop is quite fast and snappy. I had no numbers to quantify my feeling then, but now I do. Using Bootchart, I profiled the boot times on Natty. So let's see what happens. Moreover, we'll check if there's anything we can do to make things better.

  Natty Narwhal boot times - What has changed?