I have a MacBook Pro 5.3 mid 2009 and use CAD software to design houses. the latest CAD upgrade is taxing the poor thing. it still works well enough i suppose, but if i have to do a big design job it slows down. it seems to be fine in 3D but zooming is a bit jittery and there is a lag when doing the drawing. a friend suggested i upgrade to an SSD. from what i have read and my basic understanding of these magic silver boxes, it will speed everything up except the rendering, because that is more graphics card related and not memory access. so basically, will the investment help in my case or is it simply time to buy a new machine?