Office for Mac Issues

Fix Microsoft Word for Mac Slow and Lagging While Editing

Phi Hung Vo Sep 27, 2026 868 views

Question details

The user experiences slow performance, lagging, or unresponsiveness when editing multiple documents or large files in Microsoft Word for Mac.

How to Fix Microsoft Word for Mac Slow and Lagging While Editing

Product: Microsoft Word for Mac
Device & OS: Mac OS (Apple Silicon or Intel)
Scenario: Editing multiple documents or very large files.
Observed behavior: The application becomes slow, lags, or becomes completely unresponsive during editing.

Before you start

Before troubleshooting, ensure that you have saved your current work and closed any unnecessary background applications to free up system memory.

Solution 1Recommended

Boot in Safe Mode and Validate Fonts

Use Mac's Safe Mode to clear the font cache and identify conflicting background software or corrupted fonts that are slowing down Word.

Safe Mode uses a minimal set of fonts, clears the system font cache, and prevents startup applications from running. This helps isolate performance issues related to third-party tools or corrupted fonts on both Apple Silicon and older Intel Macs.

Start Apple Silicon Macs in Safe Mode

Shut down your Mac. Press and hold the power button until 'Loading startup options' appears. Select your startup disk, press and hold the Shift key, and click 'Continue in Safe Mode'.

Start Intel Macs in Safe Mode

Restart your Mac and immediately press and hold the Shift key until you see the login window.

Test Microsoft Word

Open your large files in Word while in Safe Mode. If the lagging and slow performance disappear, restart the Mac normally to proceed with font validation.

Validate fonts using Font Book

Open the Font Book app from your Applications folder. Select all fonts, choose 'File' from the top menu bar, and click 'Validate Fonts' to find and remove any corrupted fonts.

Font conflicts: Corrupted or duplicate fonts are a very common cause of Microsoft Word slowdowns and crashes on macOS.

Solution 2

Disable Conflicting Third-Party Utilities

Turn off add-ins and background software that might interfere with Word's performance.

Free Microsoft Office alternative

Experience Smooth Editing with WPS Office for Mac

If Microsoft Word continues to lag or freeze on your MacBook, consider switching to WPS Office. It is a highly optimized, lightweight, and completely free alternative that runs seamlessly on both Apple Silicon and Intel Macs.

1. Download WPS Office: Visit the official WPS Office website and download the Mac version free of charge.
2. Install on your Mac: Open the downloaded installer and drag the WPS Office icon into your Applications folder.
3. Open and edit your files: Right-click your existing .docx files and choose 'Open with WPS Office' to experience lag-free editing.

Highly optimized for macOS, ensuring fast and smooth editing even with large files.Fully compatible with Microsoft Word (.docx), Excel (.xlsx), and PowerPoint (.pptx) formats.Lightweight application size that uses minimal system RAM and CPU resources.Familiar, clean user interface that requires no learning curve to migrate.

microsoft office alternative - wps office

Frequently Asked Questions

Why does Microsoft Word lag only when editing large files on my Mac?

Large files with numerous high-resolution images, complex tables, or heavy formatting require significantly more memory and processing power. If your Mac's RAM is heavily utilized by background apps, Word struggles to process edits in real-time, resulting in noticeable lag.

Can third-party plugins like Grammarly or Mendeley cause Word for Mac to slow down?

Yes, third-party add-ins such as grammar checkers and citation management tools continuously scan and process your document as you type. In large or complex documents, this constant background processing can severely bottleneck Word's performance.

Does clearing the Mac font cache permanently fix Word performance issues?

Booting into Safe Mode safely clears the system font cache, which often resolves temporary glitches and speeds up Word. However, if you have permanently corrupted fonts installed on your Mac, you must actively identify and remove them using the Font Book application to prevent the lag from returning.

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