Fix Windows 11 Performance Issues After Update – KB5035853 2026

System file corruption is the most common cause of post-update slowdowns. Run these commands to repair corrupted Windows files:

1. Press Windows + X and select Windows Terminal (Admin)
2. Run System File Checker:

   sfc /scannow

3. Wait for completion (15-30 minutes). If corruption is found, run DISM repair:

   DISM /Online /Cleanup-Image /RestoreHealth

4. After DISM completes, run SFC again to verify repairs:

   sfc /scannow

5. Restart your computer and test performance

Driver conflicts are a major cause of performance issues after Windows updates. Identify and resolve driver problems:

1. Press Windows + X and select Device Manager
2. Look for devices with yellow warning triangles or red X marks
3. Right-click problematic devices and select Update driver
4. If updating doesn't help, rollback recent driver changes:
   • Right-click the device → Properties → Driver tab
   • Click Roll Back Driver if available
5. For graphics drivers, use Display Driver Uninstaller (DDU) in Safe Mode:

   shutdown /r /o

6. Select Troubleshoot → Advanced options → Startup Settings → Restart
7. Press 4 for Safe Mode, then run DDU to completely remove graphics drivers
8. Restart normally and install latest drivers from manufacturer website

Windows Search indexer often becomes corrupted after major updates, causing system-wide slowdowns:

1. Open Windows Terminal (Admin) and stop the search service:

   net stop "Windows Search"

2. Navigate to the search database location and delete corrupted files:

   cd %ProgramData%\Microsoft\Search\Data\Applications\Windows

   del Windows.edb

3. Restart the Windows Search service:

   net start "Windows Search"

4. Alternatively, reset indexing through Settings:
   • Settings → Privacy & security → Searching Windows
   • Click Advanced indexer settings
   • Click Advanced → Rebuild → OK
5. Exclude unnecessary locations from indexing:
   • In Indexing Options, click Modify
   • Uncheck large folders like Downloads, Videos, or external drives

Updates often enable new startup programs and services that impact boot performance. Clean up unnecessary startup items:

1. Press Ctrl + Shift + Esc to open Task Manager
2. Click the Startup apps tab
3. Sort by Startup impact and disable High impact programs you don't need immediately:
   • Right-click → Disable
   • Common culprits: Adobe updaters, Skype, Spotify, gaming software
4. Open Services management console:

   services.msc

5. Disable unnecessary services (set to Manual or Disabled):
   • Windows Search (if not using search frequently)
   • Superfetch/SysMain
   • Windows Error Reporting Service
   • Distributed Link Tracking Client
6. Use MSConfig for advanced startup control:

   msconfig

7. On Services tab, check Hide all Microsoft services and disable third-party services

If other methods fail, remove the problematic update and prevent automatic reinstallation:

1. Boot into Safe Mode using:

   shutdown /r /o

2. Select Troubleshoot → Advanced options → Startup Settings → Restart
3. Press 4 for Safe Mode
4. Open Settings → Windows Update → Update history
5. Click Uninstall updates and remove KB5035853
6. After restart, prevent the update from reinstalling using Show or Hide Updates tool:

   wushowhide.diagcab

7. Alternatively, use Group Policy (Pro/Enterprise editions):
   • Run gpedit.msc
   • Navigate to Computer Configuration → Administrative Templates → Windows Components → Windows Update
   • Enable Configure Automatic Updates and set to Notify for download and notify for install
8. Use Registry Editor for Home editions:

   Windows Registry Editor Version 5.00
   
   [HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU]
   "NoAutoUpdate"=dword:00000001