9.1 runs great on my 2400c but I've got a 320MHz G3 and 112MB RAM. 8.6 is better for less RAM and a lesser CPU. Bill On Dec 18, 2005, at 11:45 AM, Joseph Fisher wrote: > Which OS gives the 2400 the best speed & performance? (ie when does > the OS upgrade factor begin showing the limits of even a fully > upgraded machine or what OS upgrades result in the need for Houdini > style tactics to load on a 2400 etc.)