Office Performance Issues

How to Fix Microsoft Word Running Slow with Persian and Arabic Fonts

Maira Mehtab Sep 21, 2026 869 views

Question details

Microsoft Word 2019 becomes heavily loaded and slow when handling documents exceeding 100 pages that contain Persian and Arabic fonts.

Product: Microsoft Word 2019 64-bit
Device & OS: not provided
Scenario: Editing large documents (over 100 pages) containing right-to-left languages such as Persian and Arabic.
Observed behavior: The application experiences extreme lag and high resource load, with limited performance improvement when changing fonts or starting a new document.

Before you start

Verify that your Microsoft Word 2019 is updated to the latest build, as performance patches for Right-to-Left (RTL) language processing may have been released.

Solution 1Recommended

Submit Performance Feedback to Microsoft

Since this is a known performance bottleneck with large right-to-left text documents across multiple devices, reporting it directly helps the development team release a targeted patch.

Because this lagging issue often stems from how the Word 2019 engine processes complex RTL fonts in large volumes, typical local fixes (like changing fonts) offer limited relief. The most effective course of action is to submit a detailed report to the developers.

Open the Feedback Menu

Open Microsoft Word and navigate to the 'File' menu in the top-left corner, then select 'Feedback' from the bottom of the left-hand pane. Alternatively, click on 'Help' and choose 'Feedback'.

Report the Issue

Click on the option to report a problem (usually labeled 'I Don't Like Something').

Provide Document Details

Include critical details in your report: specify the document size (e.g., >100 pages), the exact fonts used (Persian/Arabic), your Word version (2019 64-bit), and the performance symptoms (extreme slowness and high load).

Submit for Investigation

Click submit so the Microsoft Word development team receives the diagnostic data and can investigate the RTL performance issue.

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Try WPS Office for Smoother Document Editing

If Microsoft Word struggles to process your large right-to-left documents, WPS Office offers a lightweight, highly optimized word processor. It provides excellent performance for large files while maintaining seamless compatibility with your existing Microsoft Office formats.

1. Download WPS Office: Install the free WPS Office suite from the official website.
2. Open Your Document: Launch WPS Writer and open your large Persian or Arabic .docx file directly.
3. Edit Smoothly: Experience faster editing and seamless font rendering without the heavy system resource load.

Lightweight architecture ensures smooth scrolling and editing in 100+ page documents.Fully compatible with Microsoft Word (.docx) formats to ensure zero data loss.Free and easy to use with a familiar, user-friendly interface.Stable performance even with complex formatting and right-to-left language fonts.

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Frequently Asked Questions

Why does Word lag when using Persian and Arabic fonts?

Word often consumes more memory and processing power when rendering complex Right-to-Left (RTL) scripts with ligatures. In documents exceeding 100 pages, this compounding resource demand can cause severe application lag.

Will changing the font fix the lag in large Arabic documents?

Changing fonts or copying the text into a new document typically provides only limited, temporary relief. The core issue lies in how the Word engine processes large volumes of RTL text formatting.

Are there settings to improve Word's performance with large files?

You can try disabling hardware graphics acceleration or hiding spelling and grammar errors as temporary workarounds, but if the issue is rooted in font processing bugs, you may need an alternative office suite or an official software patch.

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