The Basics..
Not too much will go wrong on a Mac,
but if you get poor performance,
do the same as we recommend on a PC.
Simplify, then Add, then Test
Simplify = Turn off all extensions, (the
things that load at startup, programs, system tools, drivers, etc)
To boot with no extensions, hold down the SHIFT key while the Mac is turning
on
If the Mac does better with all the extensions
off, then you're off to track down what was not needed
Add = Now go to the EXTENSION MANAGER in
the Mac control panels Create a new set of Extensions from the drop
down menu at the top of the control panel, start with a "Base
Set" and ...
Test = restart the Mac with the new set
of extensions, see how it performs. If it's better than you are in
good shape, add what ever else you might need from the "Extensions
Manager" control Panel a few at a time, then restart and test
Follow this process to get he Mac to start with
less running, so it has more potential waiting for you