Mavericks Install time
Just so folks have an idea of time necessary for the mavericks upgrade - I downloaded and installed mavericks on its first night of release. The actual download time wasn't bad - about 10 minutes at 7.2 MBps (or 57.6 Mbps - darned good speed, considering my service tops out at a nominal 50Mbps - but often gets more, closer to 60Mbps).
My computer is a 2009 dual quad core Mac Pro. 2.26 GHz - not blindingly fast, but hanging in there.
After the download, then the long delay - TWO HOURS of number crunching to finish the install. I was concerned when, with 18 minutes left to complete, my screen went black. I started worrying about conflicts with the 3rd party peripherals attached - but no need. I remembered my energy saving settings put my screen (only) to sleep a bit short of 2 hours. Moving the mouse restored it. However, it went to sleep several more times before the installation was complete. There was no disruption of the install proces, however.
Pay no attention to the estimated times shown in the "time remaining" windows. One early estimate was 26 hours. That finally adjusted - but the times are still wildly inacurate. Inside 18 minutes remaining for the Mavericks completion, each "minute" took 3 to 4 actual minutes to tick off. The final "Less than 1 minute" took 10. But that was no different from earlier OS updates, which were just as bad.
I upgraded iMovie, iPhoto and Aperture after installing Mavericks. The downloads/installation of just those 3 apps took over 2 hours, with speeds in the range of 60 to 700 KBps, likely becaus the App Store was deluged - thee were Safari and other app upgrades out for Lion and Mountain Lion systems too, plus the 3 needed with Mavericks.
I had expected the first startup after the installation would be slow, and it was. What was surprising ws how slow the whole computer was - to the point that I shut down and restarted. It improved, but was still slow. Too tired and way past my bedtime, I shut it down. However, on start today, everything was fine. I don't notice much speed improvement over Mountain Lion - I was looking for some because of Mavericks' allegedly improved memory management. But, I'm running 12 GB of RAM anyway, and have yet to max it out - so likely that isn't a big factor on this machine.
PowerMac, Mac OS X (10.7.1)