How to Fix a Slow Windows 11 PC: The Ultimate OS Cleanup Guide

You can fix a slow Windows 11 computer immediately by disabling unnecessary startup applications, clearing the system cache files, and running a built-in storage optimization audit.

You do not need to purchase expensive cleaning software to restore your operating system's original speed. Follow this step-by-step health audit to safely remove system clutter and free up storage space.

Step 1: Disable High-Impact Startup Apps

Many programs force themselves to launch the moment you turn on your PC, dragging down system boot times and hogging RAM.

1. Press Ctrl + Shift + Esc on your keyboard to open the Task Manager.
2. Click on the Startup apps icon (the speedometer logo on the left sidebar).
3. Look at the Startup impact column.
4. Right-click any non-essential app (like Spotify, Discord, or Steam) and select Disable.

Step 2: Purge Temporary System Cache Files

Windows stores junk installation files and internet caches that waste disk space and slow down system indexing.

1. Press the Windows Key + R to open the Run dialog box.
2. Type Storage Sense into the Windows search bar and hit Enter to open system settings.
3. Toggle Storage Sense to On. This allows Windows to automatically delete temporary files when disk space is low.
4. Click on Temporary files manually, check the boxes for Temporary Files and Previous Windows Installations, and click Remove files.

Step 3: Run the Built-In Deployment Image Audit (DISM)

If your operating system is freezing or dropping frames, deep system files might be corrupted. Windows has a built-in tool to repair them.

1. Type cmd into your Windows search bar.
2. Right-click Command Prompt and select Run as administrator.
3. Type the following command exactly and press Enter:

DISM.exe /Online /Cleanup-image /Restorehealth

4. Wait for the progress bar to hit 100%, then restart your computer.