My mac is 2 years old. I have a 21.5 inch with 4GB.The iMac has been wonderful and pretty fast. My question is some movies or videos I watch online, say from you tube or other places start and stop during the video while am I am watching it. This is annoying. Is my problem that I need more Ram or do I need a faster DSL. I have Frontier as my server. And if it is the RAM , how much more do I need. I need feedback. Thank you, Buffybaby