In the realm of macOS system processes, few are as deceptively impactful as CMFSyncAgent. This process, responsible for syncing shared items and contacts, has recently been at the forefront of high CPU usage issues on various MacBook models, puzzling both seasoned technicians and everyday users. As one dives deeper into the mechanics of CMFSyncAgent, it becomes evident that understanding its intricacies is crucial not just for system optimization, but also for preempting potential performance pitfalls. Join us as we dissect the role of CMFSyncAgent, explore its sporadic aberrant behaviors, and uncover strategies to harmonize its operations with your MacBook’s ecosystem.

When we consider system processes that could potentially disrupt a MacBook’s seamless operation, CMFSyncAgent might not be the first name on many users’ lips. Yet, for those of us operating on the Apple Silicon chip, particularly in models like the MacBook Pro with the M1 Pro chipset, this unassuming process has caused inexplicably high CPU usage during seemingly routine tasks. Delving deeper reveals an unusual correlation: apps such as Gojek, known for incessantly updating contact entries with a plethora of numbers, and other software like Tellows-iOS-app that tends to cluster hundreds of numbers under a single contact, become inadvertent culprits. How does a humble contact lead to such significant system turmoil?

Understanding the Issue:

  1. System Processes: The two processes – sharingd and cmfsyncagent are responsible for syncing shared items and contacts respectively. When they try to sync a contact with an abnormal number of entries, they are likely to face difficulties, leading to high CPU usage.
  2. Third-party Apps: Some third-party apps like Gojek have the capability to add multiple numbers under a single contact. If not monitored, this can lead to a massive build-up over time, thereby causing the aforementioned syncing problems.
  3. Console Entries: The repeated console entries can act as a sign or symptom to the users that there’s an issue with certain syncing activities.

Steps to Resolve:

  1. Identify the Problematic Contact: A quick look into the Contacts app can help users identify contacts with abnormally high numbers. In many cases, it’s the Gojek contact.
  2. Delete the Problematic Contact: Once identified, deleting the problematic contact will immediately resolve the CPU usage problem.
  3. Restrict App Access: For preventing future issues, it’s advised to restrict certain apps (like Gojek) from accessing and modifying the contact list.
  4. Regular Monitoring: Regularly monitoring the contact list and looking out for any anomalies can help in preempting such issues in the future.
  5. Google Account Contacts Sync: For those who had issues even after resolving the Gojek contact problem, checking synced contacts from their Google account proved beneficial. It’s a good practice to occasionally audit the contacts synced from Google and remove any unnecessary or suspicious entries.


While it’s convenient for apps to access and modify our contacts for enhanced functionality, it’s equally crucial for users to be vigilant about the permissions granted. Unmonitored, these permissions can lead to unexpected system behaviors. The high CPU usage problem on MacBooks due to problematic contacts is a testament to this. As always, periodic checks and a keen eye on system processes can save a lot of troubleshooting time in the long run.