I currently have a G4/400 with 320 MB of RAM. My machine is pretty sluggish sometimes while opening browser windows, using Safari with a lot of windows open and while using many programs at once (don't have the option of using less programs at once). I want to upgrade my machine, but what do I need to do? Processor upgrade? RAM upgrade? If you suggest upgrading the processor, please post a link to a page with information on the upgrade. TIA.