Fix: Mac is Running Slow due to AddressBookSourceSync

Fix: Mac is Running Slow due to AddressBookSourceSync

Is your Mac running slower than usual? Do you constantly experience delays and freezes when using applications? One of the potential causes of this issue might be AddressBookSourceSync, a process on your Mac that manages the synchronization of your contacts between your devices. While this process is essential for keeping your contacts updated, it can also lead to a slowdown of your Mac’s performance. In this article, we will discuss the causes and solutions for Macs running slow due to AddressBookSourceSync and how to optimize your device’s performance. By following these steps, you can get your Mac back up to speed and running smoothly.

How to Fix Mac is Running Slow due to AdressBookSourceSync

How to Fix Mac is Running Slow due to AdressBookSourceSync

If you’re a Mac user, you may have noticed that your computer is running slower than usual. This could be due to various reasons, but one common culprit for slow Mac performance is AdressBookSourceSync.

AdressBookSourceSync is a background process that syncs your contacts from your Address Book to various applications and services, such as Mail, Messages, and iCloud. While this process is meant to make your life easier by keeping your contacts up-to-date and accessible on different platforms, it can also drain your system resources and slow down your Mac. Here’s how to fix it.

1. Check for updates

The first step in fixing any software-related issue is to make sure that you’re using the latest version. Check for updates for your operating system and all your applications, including the Address Book. Sometimes, the latest version might have fixed any bugs or performance issues that could be causing AdressBookSourceSync to slow down your Mac.

2. Limit the number of contacts

If you have a large number of contacts in your Address Book, it could be causing AdressBookSourceSync to work harder and slow down your Mac. Consider reducing the number of contacts by deleting duplicates, outdated, or irrelevant entries. You can also transfer some contacts to another application or service, such as Google Contacts or Outlook.

3. Disable unnecessary sync

AdressBookSourceSync not only syncs your contacts, but it also syncs other data such as calendars, bookmarks, and notes. If you don’t need these synced, you can disable them to reduce the workload on AdressBookSourceSync. To do this, go to System Preferences > Internet Accounts and uncheck the boxes next to the data you don’t want to sync.

4. Adjust the sync frequency

Another way to reduce the load on AdressBookSourceSync is to adjust the sync frequency. By default, it is set to sync every hour, but you can change it to every few hours or even once a day. To do this, go to System Preferences > Internet Accounts and select the account you want to change the sync frequency for. Then click on the Options button and select a new sync interval.

5. Disable AdressBookSourceSync completely

If you don’t use any of the applications or services that require AdressBookSourceSync, you can disable it completely. This will prevent it from running in the background and consuming your system resources. To do this, go to System Preferences > Security and Privacy > Privacy > Contacts. Then uncheck the box next to the application or service that you don’t want to sync your contacts with.

6. Restart your Mac

Sometimes, a simple restart can fix many software-related issues, including problems with AdressBookSourceSync. So, if you’ve tried all the above steps and are still experiencing slow performance, try restarting your Mac and see if it makes a difference.

In conclusion, AdressBookSourceSync is a useful tool, but it can also slow down your Mac if not managed properly. By following the above steps, you should be able to fix any performance issues caused by AdressBookSourceSync and ensure that your Mac runs smoothly.


In conclusion, if you have noticed that your Mac is running slower than usual and you use the Address Book app frequently, it is likely that AddressBookSourceSync is the culprit. By following the steps mentioned above, you can easily fix this issue and improve the performance of your Mac. It is important to regularly update your software and manage your contacts and calendars to avoid facing this problem in the future. Remember to also regularly clean up unnecessary files and programs to keep your Mac running smoothly. With these simple fixes, your Mac will be back to its speedy self in no time.

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