How to Fix mds_stores Consuming High CPU Usage on Mac

Mac users occasionally encounter issues with their system performance, and one common culprit is the mds_stores process consuming high CPU usage. mds_stores, short for “Metadata Server Stores,” is a core component of macOS responsible for indexing and managing metadata for files, aiding in faster searches and organization.

However, when mds_stores starts consuming excessive CPU resources, it can slow down your Mac and affect productivity. In this guide, we’ll delve into the reasons behind mds_stores consuming high CPU usage and provide comprehensive solutions to resolve this issue effectively.

What is mds_stores on Mac?

Before delving into solutions, it’s essential to understand the role of mds_stores in the macOS ecosystem. mds_stores is a process associated with the Spotlight search feature, which indexes the contents of your Mac’s storage drive to facilitate quick and efficient searches. It catalogs metadata such as file attributes, content, and file relationships, enabling users to find files and applications swiftly using keywords.

When you perform a search on your Mac using Spotlight, mds_stores kicks into action, retrieving indexed information from its database and displaying relevant results in real-time. This indexing process is ongoing in the background to ensure that the search results are up-to-date and comprehensive.

Reasons Behind High CPU Usage by mds_stores

Despite its crucial role in enhancing user experience, mds_stores can sometimes become problematic, consuming excessive CPU resources and causing performance issues. Several factors can contribute to this behavior:

Indexing Large or Corrupted Files: If mds_stores encounters large files or files with corrupted metadata during the indexing process, it may struggle to process them efficiently, leading to increased CPU usage.

External Drives and Network Volumes: When you connect external drives or network volumes to your Mac, mds_stores may attempt to index their contents alongside the internal storage, resulting in additional CPU utilization.

Spotlight Reindexing: Occasionally, macOS may initiate a Spotlight reindexing process due to system updates, changes in file structure, or disk errors. During this reindexing process, mds_stores can consume high CPU resources as it rebuilds the index from scratch.

Third-Party Applications: Certain third-party applications or utilities can interfere with the normal operation of mds_stores, causing it to consume more CPU than usual. This could be due to conflicting processes or incompatible software.

File System Errors: Errors or corruption within the file system can also impact the performance of mds_stores, leading to increased CPU usage as it attempts to navigate through problematic files and directories.

Fix mds_stores Consuming High CPU Usage

Now that we understand the potential causes of high CPU usage by mds_stores let’s explore various solutions to address this issue effectively.

1. Monitor Activity Monitor

The first step in troubleshooting high CPU usage by mds_stores is to identify whether it’s indeed the culprit. Launch the Activity Monitor utility (Applications > Utilities > Activity Monitor), and click on the CPU tab to view the processes consuming the most CPU resources. Look for mds_stores in the list and observe its CPU usage over time. If it consistently ranks high, it’s likely the cause of the performance issue.

2. Check Spotlight Indexing Status

macOS provides a built-in mechanism to check the status of Spotlight indexing. Open System Preferences, select Spotlight, and navigate to the Privacy tab. If you see any drives or folders listed here, it indicates that Spotlight is actively excluding them from indexing. Conversely, if you notice a progress bar indicating indexing activity, allow Spotlight to complete the process. Interrupted indexing can sometimes lead to mds_stores consuming high CPU resources.

3. Exclude Problematic Folders from Indexing

If you suspect that specific folders or files are causing mds_stores to consume excessive CPU, you can exclude them from Spotlight indexing. Go to System Preferences > Spotlight > Privacy, and click the “+” button to add folders or drives to the exclusion list. This prevents Spotlight and mds_stores from indexing those locations, potentially alleviating the CPU usage issue.

4. Reset Spotlight Index

If Spotlight indexing appears to be stuck or corrupted, resetting the index can help resolve the issue. Open Terminal (Applications > Utilities > Terminal) and enter the following command:

   sudo mdutil -E /

Press Enter and provide your administrator password when prompted. This command instructs macOS to erase the existing Spotlight index and initiate a fresh indexing process. Allow some time for the indexing to complete, and monitor CPU usage to see if the problem persists.

5. Verify Disk Utility

Disk errors or file system corruption can also contribute to mds_stores consuming high CPU resources. Run Disk Utility (Applications > Utilities > Disk Utility), select your Mac’s startup disk, and click on the “First Aid” tab. Click “Run” to initiate a disk verification and repair process. If any issues are detected, Disk Utility will attempt to repair them automatically. Once the process is complete, restart your Mac and check if the CPU usage by mds_stores has normalized.

6. Update macOS and Apps

Outdated software can sometimes lead to compatibility issues and performance problems. Ensure that your macOS version and all installed applications are up-to-date. Open the App Store and navigate to the Updates tab to install any available updates for macOS and third-party apps. Additionally, keeping your system and apps updated can patch security vulnerabilities and improve overall stability.

7. Identify Third-Party Culprits

If mds_stores continues to consume high CPU usage after following the above steps, consider whether any recently installed third-party applications might be causing conflicts. Temporarily uninstall or disable suspicious apps and observe if it makes a difference in CPU usage. You can use Activity Monitor to monitor CPU usage before and after removing specific applications to pinpoint the culprit.


High CPU usage by mds_stores on Mac can be frustrating, but with the right troubleshooting steps, you can resolve the issue and restore your system’s performance.

By understanding the role of mds_stores and exploring various solutions such as monitoring Activity Monitor, checking Spotlight indexing status, excluding problematic folders, resetting Spotlight index, verifying disk utility, updating macOS and apps, and identifying third-party culprits, you can effectively mitigate the problem.

Remember to approach troubleshooting systematically and be patient as you implement each solution. With persistence and attention to detail, you can enjoy a smoother and more responsive Mac experience.

Leave a Comment