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This is identical to Right-clicking and Force Quitting. You can summon the Force Quit Applications menu by hitting CMD+Option+ESC and selecting it there.This is identical to CMD+Q, only it forces an application to close. You can select Force Quit by right clicking the application in the Dock.Sometimes this wakes up the application, but also shuts it down in the process. You can try focusing it (so that its name appears in the Menu bar at the top of the screen) and hitting CMD+Q.This rarely works if it hasn't become responsive after 10 seconds of waiting. You can wait for it to become responsive again.When you notice an application is hanging (it takes too long to respond and/or you get the spinning beach ball cursor), you have several choices: So if an application is hanging frequently without using up all CPU or RAM, some hints might be dropped by sampling it while being frozen, like in this example. Unless you’re a low-level language programmer, you likely won’t understand what’s going on here, but this option lets you sample a process for a few seconds - i.e., log which functions it calls and where - and see what exactly is going on deep down in the OS and the other processes that ran the application. you open an image in Preview) - this only lists the files and ports the process is using in order to workĪnother option we can mention is Sampling. Please note that an open file will not be listed here (i.e. Open Files and Ports: The files and ports in use by the application / process.Statistics: Other stats like how long it's been alive, how many threads are active at the moment, etc.Memory: The amount of each type of memory the process is using.However, it's good practice just going through the offered tabs: This part isn’t especially important, unless you're nitpicking - the thing with OS X performance is that it’s usually fairly evident what’s causing the delays and hangs from the main screen without going into too much detail. Let us first have a look at the main part of the screen - the data table of processes. Please open the Activity Monitor now by going to Applications -> Utilities -> Activity Monitor, or by just searching for Activity Monitor in Spotlight.

The Activity Monitor is OS X’s native GUI application for taking your computer’s pulse. It is Apple’s version of the Task Manager in Windows. It also helps you see network traffic, disk write/read operations and other useful diagnostic data. It shows you the processes that are running, the memory being used, who the biggest resource hogs are and allows you kill off the processes that are being too selfish with your computer’s resources. While most of the discussed functionality should remain the same in newer versions, it might not exist or might have different nomenclature in older versions. (the default Mountain Lion version) in this article. Note: we will be looking at Activity Monitor 10.8.0. In this overview of the Activity Monitor, we dissect the user interface, learn to manage memory, kill unresponsive applications and dissect active processes. Not many casual users know about the Activity Monitor, fewer still understand what it can really do apart from force-quitting an application.