Marcus opened his mouth. Closed it. He felt like a sailor who had just been told that a rudder is optional if you just flap your arms hard enough.

Then, with a sudden surge of rebellion, he opened the Finder. He navigated to his Downloads folder. A file was missing. He knew, logically, that the folder just hadn't polled the drive yet. On a PC, he would hammer F5 until the file appeared like a reluctant confession.

If your entire system feels sluggish and a simple "refresh" isn't working, you may need to refresh the system resources:

Press Command (⌘) + R to check for the latest updates.

On a standard Windows keyboard, is the refresh key. On a Mac, F5 is typically mapped to a system function, such as decreasing keyboard brightness or dictation (depending on your settings).