Close unresponsive apps and processes
Unless otherwise noted, your Mac should be running at least macOS 10.13 High Sierra to use these tools, and your Mac should generally be a 2011 or later model (excluding early Mac Pros). FaceTime: You can videoconference with someone using another Mac, or even with those using iOS devices like the iPhone 4 (or later) and the iPad. Messages: Messages lets you use your iMac to chat with others around the world for free via the Internet — by keyboard, voice, or (with your iMac’s built-in FaceTime HD web camera) full-color video.
Things For Iphone
When your system is acting sluggish or simply not responding, an app or process may be the source of the problem. You can use Activity Monitor to locate the troublesome app or process and force it to quit.
See how much energy your Mac is using
You can find out how much energy your Mac is using, and see which apps or processes are using the most energy.
See real-time CPU, network, or disk status in the Dock
It’s easy to keep an eye on your system status without even looking at the Activity Monitor window—you can monitor your CPU, network, or disk usage as a live graph right in the Dock.
Using Things For Mac Computers
To browse the Activity Monitor User Guide, click Table of Contents at the top of the page.