I have a late 2008 15" MacBook Pro 2.4Ghz C2D laptop that I'm trying to improve responsiveness on. I have 3GB of RAM and barely go above 2GB used, and my CPU usage generally stays under 40%. But what I've noticed is that many times it takes a while to boot and for apps to open. And when transferring files, my system becomes extremely laggy. So I've considered getting an SSD to help with this. Would an SSD help with overall responsiveness?