Why Is My Windows Cache Taking So Much Space

What Causes This?

Windows uses cache files to speed things up, including thumbnails, update files, browser data, temporary app files, and parts of system processes. Over time, these cached files can pile up and stop being useful, especially after Windows updates, app installs, failed downloads, or long periods without cleanup. In some cases, a specific app or service keeps generating temporary data faster than Windows removes it.

Common Symptoms

• Your C: drive keeps losing free space for no clear reason
• Storage settings shows large amounts of Temporary files or System files
• Windows Update downloads take up space even after updates finish
• Apps feel sluggish or fail because the drive is nearly full
• Disk Cleanup or Storage Sense only frees a small amount of space

How to Fix It Manually

1. Check what is using space in Storage settings

   1. Press Windows + I to open Settings.
   2. Go to System > Storage.
   3. Wait for Windows to calculate usage, then review categories like Temporary files, Apps, and Other.
   4. Click Temporary files to see what Windows says can be removed.

2. Delete temporary files safely

   1. In Settings > System > Storage > Temporary files, let the scan finish.
   2. Review the list carefully.
   3. Check items such as Temporary files, Thumbnails, DirectX Shader Cache, and Delivery Optimization Files.
   4. If you do not need to roll back a recent Windows version, you can also remove Previous Windows installation(s) if shown.
   5. Click Remove files.

3. Run Disk Cleanup for system cache

   1. Press Windows + S, type Disk Cleanup, and open it.
   2. Select your C: drive and click OK.
   3. Click Clean up system files.
   4. Select C: again if prompted.
   5. Check items like Windows Update Cleanup, Temporary Internet Files, Temporary files, and Thumbnails.
   6. Click OK, then Delete Files.

4. Clear the temp folders manually

   1. Press Windows + R, type %temp%, and press Enter.
   2. Press Ctrl + A to select everything, then press Delete.
   3. Skip any files that say they are in use.
   4. Press Windows + R again, type temp, and press Enter.
   5. Delete what you can there as well. You may be asked for administrator permission.

5. Clear Windows Update cache if update files are stuck

   1. Press Windows + S, type services, and open Services.
   2. Find Windows Update, right-click it, and choose Stop.
   3. Open File Explorer and go to C:\Windows\SoftwareDistribution\Download
   4. Delete the files inside the Download folder.
   5. Go back to Services, right-click Windows Update, and choose Start.

6. Turn on automatic cleanup

   1. Open Settings > System > Storage.
   2. Turn on Storage Sense.
   3. Click Storage Sense and choose how often Windows should remove temporary files and empty the Recycle Bin.
   4. Run it once immediately if needed.

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