My iMac (27", 2.93GHz) had 4GB (2x2GB) from the beginning. Recently i purchased an extra 16GB (2x8GB) module. I took off the 4GB, placed the 16GB and i noticed that boot time takes longer. The chime was heard a 4.8sec and now with the more memory placed its heard at 7.9sec. Users window at boot used to appear at 25.8sec now its appearing at 37.1sec. Is it normal for boot time to take longer when one places more memory? Is there some app that i can check with, the speed of my imac?