Show inactive memory as free in menubar
If on, inactive memory will be included as if it were free memory. Doing this generally gives a better impression of the amount of memory available for use by applications.
Wired memory — This is memory that applications or the system needs immediate access to, so it can’t be cached to disk. It will vary depending on what applications you’re using.
Active memory — This is memory that is actively being used.
Inactive memory — This memory is no longer being used and has been cached to disk. It’ll remain in RAM until another application needs the space.
Free memory — This memory is not being used.