1. Block Apps Internet Access Mac Sierra Mac
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3. Block Apps Internet Access Mac Sierra Free
4. Macos Block App Internet

Everyone seems to love Sierra, but if your experience is like dragging your Mac through a swamp then it’s time to do something about it.

Let’s fix slow macOS Sierra

In this guide we’re going to highlight the most common problems that cause a slow Sierra and the solutions to help you speed up macOS. These solutions can be performed by anyone, but we’ve ordered them from easiest to hardest.

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See how far up the Sierra speed solution ladder you can get.

Step 1 - Eliminate desktop clutter

Difficulty: Easy

Are you someone that puts everything on their desktop? To load all those icons takes up system resources that could be used for better things. Delete what you don’t need and group what you do into folders to improve macOS Sierra performance.

To quickly move files into folders:

• Hold Control and click the items you want to group
• Right-click any of the selected files and choose 'New Folder with Selection'

That was easy, wasn’t it? Now let’s use one of Sierra’s space saving features.

Step 2 - Optimize storage

Difficulty: Easy

Another way to free up space is to use one of Sierra’s features - the ability to automatically remove files that you don’t need. Optimized storage can remove old video files (like that movie you watched months ago) that you can always download from iTunes again. It can also remove old email attachments, which remain stored on the mail server should you need them again.

Clearing out old videos and email attachments can save a lot of space on your Mac and improve overall Sierra performance. Please note that you need to use Apple’s Mail app to make use of the email attachment setting. Also, having watched videos suddenly disappear may not be to everyone’s taste.

However, if you want to turn these settings on, follow these steps:

• Go to About This Mac
• Click on the Storage tab and click on Manage
• Select Optimize
• Check 'Automatically remove watched iTunes movies and TV shows'
• Check 'Download only recent attachments' or to manually decide what gets downloaded, choose 'Don’t automatically download attachments'

If you tried these options but prefer the old way you’ll need to navigate to iTunes > Preferences > Advanced to uncheck 'Automatically delete watched movies and TV shows.'

If you want Sierra to download all your attachments again go to Mail > Preferences > Accounts > accountName > Account Information. Click on the Download Attachments drop-down menu and select 'All.'

That was a bit more work but still really easy, right? Next up is a way to always speed up a slow Sierra.

Step 3 - Remove background applications

Difficulty: Easy

Does your macOS slow down for no obvious reason? It could be that background apps are hogging your Mac’s memory. Most systems have multiple unneeded apps that use system resources. Next time things are slow open Activity Monitor (found in Utilities) and click on the top of the Memory column to order the apps by those that are using the most memory.

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If you see an app that is using a good portion of memory (and you’re sure you’re not using it) select it and click the X at the top left to close the app.

Easy, huh?

The next steps are a little bit more challenging but if you want a Sierra that performs well we recommend you keep going!

Step 4 - Tone down visual effects

Difficulty: Moderate

Apple uses some fancy eye candy to make the Sierra UI (User Interface) a real treat for the eyes. But if Sierra is slow, it feels more like a trick than a treat.

To give Sierra a speed boost you can turn off transparency and motion effects. This is particularly effective if macOS 10.12 is running on older hardware.

To turn off effects in Sierra follow these instructions:

• Navigate to Settings > Accessibility > Display
• Turn on 'Reduce Motion' and 'Reduce Transparency'

You should now experience a snappier Sierra experience.

In our next step we’re going to show you how to take out the trash. Afterall, a clean Sierra is a fast Sierra!

Step 5 - Clean up full Mac hard drive to speed up Sierra

Difficulty: Moderate

Macs use available storage space on hard drives for the smooth running of the OS. When there isn’t much free space and your drive is almost full, Sierra will start running slow.

If you’ve seen the macOS 'Your disk is almost full' notification then you’vedefinitely got a problem that needs fixing. You can click the 'Manage' buttonon the notification, and it will take you to the Optimize Storage features.

A better solution would be to use CleanMyMac X, which has a bunch of tools to clean up your drive. With just a couple clicks you can clear out the junk and free up a ton of storage space for smoother operations.

Here’s how to easily remove hard drive junk:

• Launch CleanMyMac X
• Click on the Smart Scan tab
• Let the app analyze your system and when it’s finished select Clean

Can you believe how much free space you have now? Your Mac should be running much better after the first 5 steps but if Sierra is still slow it’s time to get serious.

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These next steps are a bit more difficult but you’ve made it this far. Don’t stop now!

Step 6 - Reset your SMC

Difficulty: Hard

'Reset my what?' SMC stands for System Management Controller, and a reset can solve extreme levels of slowness as well as battery faults and some other hardware faults like problems with your fan.

You should only take this step if everything else has failed to speed up Sierra.

Start by closing all apps (force-quit with Command-Option-Escape if necessary) and shut down your system.

SMC reset instructions for Mac notebook:

• With your Mac shut down, plug in the power cord
• Press the power button while holding down Shift-Control-Option at the same time
• Let go and start your Mac up like normal

SMC reset instructions for Mac desktop:

• Shutdown your Mac and unplug it
• Plug it back in after 5 seconds
• Wait 5 more seconds and then start your Mac as normal

Be honest, you thought that would be much harder didn’t you? If you reset your SMC you can definitely reset your PRAM/VRAM. That’s the next step!

Step 7 - Reset PRAM/NVRAM

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Difficulty: Hard

NVRAM stands for 'non-volatile random-access memory.' 'P' used to stand for Parameter in older Macs where it is called PRAM. Resetting NVRAM is generally recommended when your Mac is behaving strangely. Things like your Mac starting with the wrong disk, screen resolution issues, or wonky battery charge reporting. If you’re not sure if you need it, there’s no harm in giving it a try just in case.

Follow these instructions to perform a PRAM/NVRAM reset:

• Turn your Mac on from a shutdown state
• When the startup chimes press Command+Option+P+R at the same time
• Hold them until your Mac restarts and you hear the startup sound again
• Let go of the keys

You’ve done it again. There are only two more steps left. Don’t stop now!

Step 8 - Speed Up Sierra’s Startup

Difficulty: Hard

If starting up macOS Sierra is taking too long it might be because you have too many startup items. Some apps you’ll want starting with Sierra, but others would be better off waiting till you open them.

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You could use Step 3 to keep manually closing down these apps but that sounds like a waste of time to us. To stop macOS Sierra startup apps and items, follow these instructions:

• Navigate to System Preferences > Users & Groups > Login Items
• Tick the apps you don’t want loading at startup
• Click the '-' button to remove the selected apps from startup

If you want even more control use CleanMyMac to easily deselect startup items or completely remove them from your macOS:

• Launch CleanMyMac
• Click the Optimization tab
• Click on 'Login Items'
• Click enabled/disabled to choose what apps load on startup and what apps don’t
• If you never use an app you can also click the check box on the left and then click Remove

Congratulations, you’ve made it to the top of the ladder. You’ve taken every step to speed up Sierra. If macOS is still slow, it’s probably that your hardware is old. In the final step we’ll show you what you can do about it.

Step 9 - Upgrade hardware to SSD

Difficulty: Very Hard

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If your Mac doesn’t have a SSD (Solid State Drive) then this single change would give you the greatest Sierra performance boost. SSDs are significantly faster than normal mechanical drives and they’re also less likely to fail.

Things to consider when shopping for a new SSD:

• What size do you need? Nothing smaller than your current system drive.
• What is your budget? SSDs are more expensive than regular drives.
• Is the drive Mac-friendly? If so it will make it easier to keep your drive’s firmware updated and performing smoothly.

With all the different Mac models out there it would be hard to give you a step-by-step instruction. But if you search for your model + 'how to add SSD' you should find the instructions you need.

Or better yet, get a professional to install it for you.

Get macOS Sierra running faster

With the solutions above you should be able to easily transform your macOS Sierra from a slug to a responsive and snappy Mac that is a joy to use.

Just remember that over time, problems that slow down Sierra will build up. Bookmark this page so you can return to these solutions if you have the need.

Alternatively, just regularly run CleanMyMac’s range of optimization and cleaning tools to keep macOS Sierra from getting slow.

These might also interest you:

OS X v10.5.1 and later include an application firewall you can use to control connections on a per-application basis (rather than a per-port basis). This makes it easier to gain the benefits of firewall protection, and helps prevent undesirable apps from taking control of network ports open for legitimate apps.

Configuring the application firewall in OS X v10.6 and later

Use these steps to enable the application firewall:

1. Choose System Preferences from the Apple menu.
2. Click Security or Security & Privacy.
3. Click the Firewall tab.
4. Unlock the pane by clicking the lock in the bottom-left corner and enter the administrator username and password.
5. Click 'Turn On Firewall' or 'Start' to enable the firewall.
6. Click Advanced to customise the firewall configuration.

Configuring the Application Firewall in Mac OS X v10.5

Make sure that you have updated to Mac OS X v10.5.1 or later. Then, use these steps to enable the application firewall:

1. Choose System Preferences from the Apple menu.
2. Click Security.
3. Click the Firewall tab.
4. Choose what mode you would like the firewall to use.

Advanced settings

Block all incoming connections

Selecting the option to 'Block all incoming connections' prevents all sharing services, such as File Sharing and Screen Sharing, from receiving incoming connections. The system services that are still allowed to receive incoming connections are:

• configd, which implements DHCP and other network configuration services
• mDNSResponder, which implements Bonjour
• racoon, which implements IPSec

To use sharing services, make sure that 'Block all incoming connections' is deselected.

Allowing specific applications

To allow a specific app to receive incoming connections, add it using Firewall Options:

1. Open System Preferences.
2. Click the Security or Security & Privacy icon.
3. Select the Firewall tab.
4. Click the lock icon in the preference pane, then enter an administrator name and password.
5. Click the Firewall Options button
6. Click the Add Application (+) button.
7. Select the app you want to allow incoming connection privileges for.
8. Click Add.
9. Click OK.

You can also remove any apps listed here that you no longer want to allow by clicking the Remove App (-) button.

Automatically allow signed software to receive incoming connections

Applications that are signed by a valid certificate authority are automatically added to the list of allowed apps, rather than prompting the user to authorise them. Apps included in OS X are signed by Apple and are allowed to receive incoming connections when this setting is enabled. For example, as iTunes is already signed by Apple, it is automatically allowed to receive incoming connections through the firewall.

If you run an unsigned app that is not listed in the firewall list, a dialogue appears with options to Allow or Deny connections for the app. If you choose Allow, OS X signs the application and automatically adds it to the firewall list. If you choose Deny, OS X adds it to the list but denies incoming connections intended for this app.

If you want to deny a digitally signed application, you should first add it to the list and then explicitly deny it.

Some apps check their own integrity when they are opened without using code signing. If the firewall recognises such an app, it doesn't sign it. Instead, the 'Allow or Deny' dialogue appears every time the app is opened. This can be avoided by upgrading to a version of the app that is signed by its developer.

Enable stealth mode

Enabling stealth mode prevents the computer from responding to probing requests. The computer still answers incoming requests for authorised apps. Unexpected requests, such as ICMP (ping), are ignored.

Firewall limitations

The application firewall is designed to work with Internet protocols most commonly used by applications – TCP and UDP. Firewall settings do not affect AppleTalk connections. The firewall may be set to block incoming ICMP 'pings' by enabling Stealth Mode in Advanced Settings. Earlier ipfw technology is still accessible from the command line (in Terminal) and the application firewall does not overrule any rules set using ipfw. If ipfw blocks an incoming packet, the application firewall does not process it.