How to Fix Windows 11 Reboot Loop and File Explorer Lag (May 2026 Update)

Did your Windows 11 PC just restart three times in a row? This is normal for the May 2026 update. It updates critical system certificates. However, if your folders feel slow now, follow my guide below to fix it.

Step 1: Check Your Update Status

First, ensure the update finished correctly.

  1. Click Start > Settings > Windows Update.

  2. Make sure it says "You're up to date".

Windows 11 Update settings showing the system is up to date with yellow highlights.


Step 2: Clear File Explorer History

A "heavy" File Explorer is the most common issue. Clearing the cache usually fixes it instantly.

  1. Press Win + S and type Control Panel.

  2. Open File Explorer Options.

  3. Click the Clear button at the bottom.

Clicking the Clear button in File Explorer Options to fix Windows 11 lag.


Step 3: Disable Transparency Effects

For a snappier interface, turn off visual transparency.

  1. Go to Settings > Accessibility > Visual effects.

  2. Toggle Transparency effects to Off.

Turning off transparency effects in Windows 11 Accessibility settings.


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Disclaimer: This guide is for informational purposes only. Proceed at your own risk. 

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