Excelsheet hang issue

 

How to Fix RADAR_PRE_LEAK_64 Error in EXCEL.EXE on Windows 11

RADAR_PRE_LEAK_64 Explained – Excel Memory Leak Warning

If you see the following error in Event Viewer:

Fault bucket 2009689730024351462, type 5
Event Name: RADAR_PRE_LEAK_64

Problem signature:
P1: EXCEL.EXE
P2: 16.0.19929.20172
P3: 10.0.22621.2.0.0

it means Windows detected unusual or continuously increasing memory usage from Microsoft Excel. This warning does not always indicate a crash, but Windows suspects a possible memory leak or abnormal resource consumption.

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What is RADAR_PRE_LEAK_64?

RADAR_PRE_LEAK_64 is a Windows Error Reporting (WER) event related to Resource Exhaustion Detection and Resolution (RADAR).

This event appears when:

• A 64-bit application uses excessive memory
• Memory usage keeps increasing over time
• Windows suspects a potential memory leak
• System resources are being consumed abnormally

This warning commonly appears with:

• Microsoft Excel
• Games
• Web browsers
• Discord overlays
• GPU utility software

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Why EXCEL.EXE Triggers RADAR_PRE_LEAK_64

In Excel, this issue is commonly caused by:

• Large workbooks
• Heavy formulas (VLOOKUP, XLOOKUP, INDIRECT)
• Power Query or Power Pivot
• VBA macros
• Problematic add-ins
• Graphics acceleration bugs
• Corrupted Office cache
• Printer driver conflicts

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Best Fixes for RADAR_PRE_LEAK_64 in Excel

1. Start Excel in Safe Mode

Steps

Press:

Win + R

Type:

excel /safe

If the issue disappears in Safe Mode, an add-in is likely causing the problem.

Disable Add-ins

• Open Excel
• Go to File → Options → Add-ins
• Select Manage: COM Add-ins
• Disable all add-ins temporarily

Common Problematic Add-ins

• Adobe PDF Add-in
• Bloomberg plugins
• Antivirus Office integrations
• Power BI connectors

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2. Disable Hardware Graphics Acceleration

GPU driver issues can sometimes trigger RADAR memory warnings in Office applications.

Steps

• Open Excel
• Go to File → Options → Advanced
• Scroll to the Display section
• Enable:

Disable hardware graphics acceleration

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3. Check Workbook Complexity

Some Excel files consume excessive memory because of complex formulas and formatting.

Common Causes

• Entire-column formulas (A:A)
• Volatile formulas:
  • OFFSET
  • INDIRECT
  • NOW
  • TODAY
• Excessive conditional formatting
• Linked external workbooks
• Large PivotTables

Simple Test

Open a blank workbook and leave Excel idle.

• If the warning does not appear → workbook-specific issue
• If it still appears → Excel installation or system issue

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4. Repair Microsoft Office

Steps

• Open Settings → Apps
• Select Microsoft 365
• Click Modify
• Run:
  • Quick Repair
  • Online Repair

This can fix corrupted Office files and configuration problems.

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5. Monitor Excel Memory Usage

Open

Task Manager → Details → EXCEL.EXE

Watch for:

• Memory usage
• Handles
• GDI objects

If memory usage continuously increases while Excel is idle, it may indicate a genuine memory leak.

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6. Update or Roll Back Office

Sometimes a specific Microsoft 365 update introduces memory-related bugs.

Update Excel

• Open Excel
• Go to File → Account
• Select Update Options → Update Now

If the issue started after a recent update, rolling back to a previous Office build may help.

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7. Check Event Viewer for Additional Clues

Open

Event Viewer → Windows Logs → Application

Look for:

• Application Error
• Office Alerts
• Hang events
• Faulting module names

This may help identify the problematic DLL, driver, or add-in.

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Is RADAR_PRE_LEAK_64 Dangerous?

Not always.

If:

• Excel is not crashing
• The system is stable
• Performance is normal

then the warning may simply be harmless background telemetry.

However, if you experience:

• High RAM usage
• System lag
• Excel freezing
• Performance degradation

then troubleshooting the issue is recommended.

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Final Conclusion

RADAR_PRE_LEAK_64 with EXCEL.EXE usually means Windows detected excessive or abnormal memory usage from Microsoft Excel. In most cases, the issue is related to:

• heavy workbooks,
• problematic add-ins,
• graphics acceleration,
• or Office update/build issues.

Running Excel in Safe Mode, disabling add-ins, repairing Office, and monitoring memory usage are the most effective solutions.

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