> It's commonplace to have 4-10GB of free memory at any given time An entry-level computer nowadays has 4GB of memory. Not free memory, total memory. That 4GB

> It's commonplace to have 4-10GB of free memory at any given time An entry-level computer nowadays has 4GB of memory. Not free memory, total memory. That 4GB has to be shared between the operating system, all running apps, and the disk cache. > and it should be utilised if it's available instead of being wasted by being unused. If it's available, any modern operating system will use it for the disk cache, instead of leaving it unused.