What is the reason that my system speed is slowing down when i install more applications? For example, when i make a fresh installation of the OS (Leopard on a G5) Safari is very fast not only in browsing but in opening etc. Then i begin to install Adobe CS2 or the major system software update, about 110 fonts. After all this system speed is degraded... why? What can i do to make it go back to its speed before all these installations?