Phoronix talks about the poor boot speed of Ubuntu 11.10, you can read it over here.
"Besides Ubuntu 11.10 "Oneiric Ocelot" continuing to regress
when it comes to increased power usage for many different systems,
another area where Ubuntu 11.10 has regressed is with its boot speed. A
clean install of Ubuntu 11.10 is definitively slower than previous
Ubuntu Linux releases. Here's another look at the Ubuntu Oneiric boot
performance along with some other new metrics to share as the official
Ubuntu 11.10 release approaches later in the week."