How to Fix “Outlook Running Slow on Windows” Error with Quick Tips & Tricks?

Performance issues in Microsoft Outlook can stem from several factors, such as synchronization problems, a large PST (Outlook data file), faulty add-ins, or data file corruption. If you’re facing the issue of Outlook running slow on Windows, this article will walk you through the common causes and provide practical solutions to troubleshoot and resolve the slowdown. Additionally, you’ll discover a powerful PST Converter Software that can help recover all your mailbox items from a corrupted PST file efficiently.

Poor performance in Outlook can seriously hinder your productivity, causing delays in sending or receiving emails and making it difficult to join or manage scheduled meetings. These issues can disrupt your workflow and overall business operations. That’s why optimizing Outlook’s performance is crucial to ensure smooth and efficient functioning without interruptions.

This blog post focuses on the common causes of the “Outlook is running slow on Windows system” problem and provides practical troubleshooting steps to help you fix it.

Reasons Why Outlook Runs Slow

Several factors can contribute to Outlook’s sluggish performance, including:

• Insufficient hardware resources like low RAM or a slow processor
• Incompatible or malfunctioning Outlook add-ins
• Issues with Graphics Hardware Acceleration
• Outdated versions of Outlook or Windows operating system
• Corrupted Outlook cache files
• Incorrect Outlook configuration or settings
• Corrupted Outlook profile or Microsoft installation files
• Damaged or corrupt Outlook data files (PST)

How to Fix “Outlook is Running Slow on Windows” Issue?

Follow these steps to troubleshoot and improve Outlook’s performance on your Windows system:

Way 1: Check and Upgrade Hardware Resources

If you regularly send and receive many emails with attachments, consider upgrading your hardware to boost Outlook’s speed:

• Increase your system’s RAM.
• Replace your traditional hard drive (HDD) with a faster solid-state drive (SSD).
• Upgrade to a modern multi-core processor.

Improving your hardware can have a significant impact on Outlook’s overall performance.

Way 2: Update Outlook and Windows

Keeping your software up-to-date helps fix bugs and enhances performance. Here’s how to update Outlook:

• Launch MS Outlook and go to File > Office Account.
• Click on Update Options, then select Update Now.
• Outlook will check for available updates; if any are found, download and install them.

If the update option is disabled (possibly restricted by your system administrator), update your Windows OS instead:

• Open Settings on your Windows 10 or 11 system.
• Navigate to Update & Security > Windows Update.
• Click Check for Updates.
• Download and install any available updates.
• Restart your computer once the updates are complete.

Updating both Outlook and Windows often resolves performance issues and bugs that cause slowdowns.

Way 3: Compact Your Outlook Data File (PST)

A large PST file can slow down Outlook by increasing data access times and consuming more system resources like memory and CPU. To improve performance, you can reduce the size of your Outlook PST file using the Compact Now feature:

• Run MS Outlook and go to File > Account Settings > Account Settings.
• Select your Outlook account and click Change.
• In the new window, go to More Settings > Advanced > Outlook Data File Settings.
• Tick Compact Now to shrink the PST file size.
• Restart Outlook and check if performance improves.

Way 4: Use Outlook’s Auto-Archive Feature

Auto-Archive helps manage mailbox size by automatically moving or deleting old emails, which reduces PST file size and enhances Outlook’s speed. To enable Auto-Archive:

• Open Outlook and navigate to File > Options.
• Select Advanced and then click on AutoArchive Settings.
• Set how often you want AutoArchive to run (default is every 14 days) and choose the archive location.
• Tick OK and restart MS Outlook to apply the changes.

Way 5: Disable Graphics Hardware Acceleration

Outlook uses your computer’s GPU to render animations and graphics, but outdated or incompatible graphics hardware can cause slowdowns. Disabling this feature may help:

• Run Outlook and go to File > Options > Advanced.
• Scroll down to the Display section.
• Check the box for Disable hardware graphics acceleration.
• Click OK and restart Outlook to see if the performance improves.

Way 6: Clear Outlook Cache

Over time, temporary files stored in the RoamCache folder can become corrupted and slow down Outlook. Deleting these cached files can help improve performance:

• Close Outlook completely.
• Hit Windows + R to open the Run dialog.
• Type %localappdata% and press Enter.
• Navigate to Microsoft > Outlook.
• Open the RoamCache folder.
• Select all files inside, hold the Shift key, and press Delete to permanently remove them.
• Restart Outlook and check if it runs faster.

Way 7: Disable Add-ins

Faulty or incompatible add-ins often cause Outlook to slow down. Disabling them can help identify the problem:

• Close Outlook.
• Press Windows + R, type outlook.exe /safe, and hit Enter to open Outlook in Safe Mode.
• Go to File > Options > Add-ins.
• Click Go next to Manage COM Add-ins.
• Uncheck all add-ins to disable them, then tick OK.
• Close Outlook Safe Mode and restart Outlook normally.
• Check if performance improves.

Way 8: Adjust Outlook Settings

Tweaking some settings can also enhance Outlook’s responsiveness:

• Open Outlook and go to File > Options > Advanced.
• Under the Other section, uncheck Use animations when expanding conversations and groups.
• Click OK to save changes.

Way 9: Create a New Outlook Profile

If your current Outlook profile is corrupted, creating a new one can fix performance issues:

• Close Outlook and open the Control Panel.
• Select User Accounts > Mail > Show Profiles > Add.
• Enter a name for the fresh profile and tick OK.
• Follow the setup wizard to add your mail account to the fresh profile.
• Set this new profile as the default profile.
• Launch Outlook using the new profile.
• Optionally, remove the old profile to avoid confusion.
• Verify if Outlook’s performance has improved.

Way 10: Repair Outlook Data File Using ScanPST.exe

Corrupt or inconsistent Outlook data files (PST) can cause Outlook to run slowly or behave erratically. You can try repairing your PST file using ScanPST.exe, also known as the Inbox Repair Tool.

This tool creates a backup of your original PST file (with a .bak extension) and attempts to fix any errors or corruption in the file. The repair duration depends on the file size and the severity of the corruption.

Once repaired, your PST file should be error-free, allowing Outlook to run smoothly and efficiently.

Note: In some cases, especially when the PST file is very large, severely corrupted, or encrypted, ScanPST.exe may freeze or fail to repair it. For such cases, it’s best to use a robust program like BitData Migration Outlook Converter. This advanced software not only repairs damaged and inaccessible PST files but also helps you convert and migrate PST files to PDF, EML, MSG, MBOX, HTML, MHT, RTF, XPS, DOC, ICS, CSV, JPEG, SVG, TIFF, Gmail, AWS WorkMail, IMAP, Thunderbird, Zimbra, and more without data loss.

Final Verdict

If you find Outlook running slow or freezing on Windows 10 or 11, try the troubleshooting steps outlined in this segment to boost its performance. Reducing the PST file size with the Auto-Archive or Compact Now features often helps.

When corruption causes issues and the built-in Inbox Repair Tool fails, using a reliable third-party solution like Outlook PST File Converter can effectively repair and move your Outlook PST files. This tool ensures your emails, contacts, calendars, journals, and other mailbox data are safely recovered and ready for use in Outlook, helping you maintain smooth and uninterrupted email communication.