Over the last few months, it seems my imac has gotten really slow. Like when I am typing, often there will be a few seconds between the time I punch the keys on the keyboard and the time they actually show up on the screen. Sometimes I can get four or five words in before the actually start to populate the screen. Even clicking on an inactive window can take a couple of seconds--very annoying for workflow. I only have 1GB of RAM, but usually all I am running is Firefox (3.5.12) or Safari, and then sometimes excel. When I open the activity monitor I notice that sometimes Firefox is using 600mb to 1gb of real memory. Could that be the reason? Any help would be great. Thanks!