Apple does mention about the effectiveness of App Nap in their official website:
The command goes something like this: caffeinate -t 3600. Using that will prevent your Mac from sleeping for one hour, as there are 3,600 seconds in an hour. See Share your Mac resources when it’s in sleep. Set the amount of time your computer or display should wait before going to sleep: Drag the “Computer sleep”. Keep your Mac from going to sleep automatically: Select “Prevent computer from sleeping automatically when the display.
“… OS X can tell when an app is completely hidden behind other windows. And if that app isn’t currently doing something for you — playing music, downloading a file or checking email, for example — App Nap conserves valuable battery life by slowing the app down.”
The screen of your Mac automatically turns off after a certain duration of inactivity. Eventually, the entire Mac goes into sleep mode depending on your configured power settings. If you have a background app running with the App Nap feature enabled, it won’t be able to prevent your Mac from going into sleep mode. And once sleep mode is activated, all your active apps will stop working.
When you resume work on your Mac, you might notice that background activity (for example, downloading files via μTorrent or other download managers) have been paused or that the internet had been disconnected while in sleep mode. Of course, OS X did this to save power, but the feature is not really helpful in this case.
If App Nap is disabled for a particular app, it won’t allow your Mac to go into sleep mode while it’s active, even in background. You can see this in action when you’re playing music in iTunes and the display turns off. In this case, iTunes keeps playing music in the background. This is because App Nap is disabled by default for iTunes.
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Prevent App Nap for specific apps
Mac OS X gives you the option to manually turn off App Nap for certain apps. If a particular app has the Prevent App Nap option, you can enable it to ensure the app will continue running in background even when your Mac inactive over a long period. The following steps below will help you to enable Prevent App Nap for specific apps.
Now, the App Nap feature won’t affect the activity of this particular app.
Prevent Mac from sleeping
As mentioned earlier, OS X’s native feature to prevent App Nap may not be available for all the apps. If you want to make sure a particular app is not paused automatically, but it doesn’t have the Prevent App Nap option in its Info window, there are some third party alternatives available to help you achieve the same.
Prevent Mac From Sleeping App DownloadPrevent Mac from sleeping when downloading
Caffeine is a useful app that sits on the Mac OS X menu bar and prevents your Mac from automatically going to sleep. Thus, it helps applications to keep running over long duration of inactivity. Depending on your requirement, you can activate Caffeine from a few minutes to a few hours or even indefinitely, when you need background tasks to be performed without any interruption. You can even turn off the display by using the Ctrl+Shift+Eject or Ctrl+Shift+Power shortcut to save power.
Get Caffeine from the Mac App Store.
Simple drawing apps for mac free. However, if you want to disable sleep on Macbook even when the lid is closed, Caffeine won’t help you in this case; NoSleep would be a better option here.
Prevent Mac from sleeping when lid is closed
NoSleep is similar to Caffeine in the way that it allows applications to keep running over long periods of inactivity. But unlike Caffeine, which only prevents your Mac from automatically going to sleep, NoSleep disables the sleep feature completely as long as it is enabled. This means your Macbook won’t go into sleep mode even if the lid is closed and background apps will keep running without any interruption. But it also means that your Mac might probably consume a lot more power when NoSleep is enabled.
To save some power when NoSleep is active, you might want to lock your Mac’s screen with the Lock Screen option from the NoSleep menu. Alternatively, you may just turn off the display by using the (Ctrl+Shift+Eject) / (Ctrl+Shift+Power) keyboard shortcut.
Get NoSleep from MacUpdate.
Note: OS X also has a a native option to permanently disable sleep on your Mac. But this is not recommended to be used over the long term.
The apps mentioned above will prevent your Mac from automatically going to sleep. Hence, if any of the applications are using an Internet connection, the connection will remain active even if the screen is locked or your Mac is not in use for a long time.
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In case you feel that your Mac is going too quickly into Sleep Mode, then you can stop Mac from automatically sleeping by either increasing the sleep timer on your Mac or by configuring the Mac to never go into sleep mode.
Prevent Mac From Sleeping App FreeStop Mac From Going into Sleep Mode
By default, all Mac computers automatically go into sleep mode after a certain period of inactivity. This feature on Mac is designed to save power and also to prevent unauthorized access, while you are away from your Mac.
Usually the period of inactivity after which the Mac automatically goes into sleep mode is 2 minutes while on battery and 10 minutes when the Mac is plugged into a direct power supply source.
The Power Saving Auto-sleep feature is turned OFF while you are watching movies or videos on your Mac and not while you are reading or going through an interesting article on a website.
This can get very annoying, especially when you are in the middle of reading something and the display on your Mac turns off and goes into Sleep Mode.
Stop Mac From Automatically Sleeping
Follow the steps below to stop Mac from automatically sleeping, whenever it is left unattended.
1. Click on the Apple Icon from the top menu bar on your Mac and then click on System Preferences option in the drop-down menu.
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2. On the System Preferences screen, click on Energy Saver.
3. On the Energy Saver Screen, click on the Power Adapter Tab and then Move the slider beside “Turn Display off After” all the way to the right to Never Position (See image below).
4. Next, click on the Battery tab and move the slider next to “Turn display off after” to Never position (See image below)
Note: Instead of choosing “Never” and not allowing your Mac to go to sleep, it is better to make your Mac stay awake for a longer duration of time by moving the slider to 15 or 30 minutes.
This way you can prevent your Mac from draining its battery, in case you happen to leave your Mac unattended for a longer duration.
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