I recently purchased a Dual Intel 20" iMac with the upgraded 256MB video card and 1GB of RAM. I currently use all iLife applications and also have Office for Mac and MSN Messenger installed. I am finding when I have multiple applications open, it really lags. I can understand that when I open iPhoto (14000+) pictures, it may take some time but I was expecting less lag. Am I expecting too much and if I maxed out the RAM (2GB), would I notice a big difference? Thanks!