My iMac Core 2 Duo 2.4 GHZ with 3 GB of memory did a very fast installation. I did archive and install, and I unchecked the languages, printer drivers, and x11. The languages and printer drivers are the big ones. They take up lots of space, and they take more time for the installation to copy all of them over, gigabytes of information. My installation took less than 20 minutes this way!! oh, I also recommend skipping the verify disk step at the start. Thanks Apple.