Why Does Windows Start Up Slowly?

A sluggish boot is one of the most common Windows complaints. It can be caused by too many startup programs, a cluttered hard drive, outdated drivers, or even hardware limitations. The good news: most causes are easy to address without any technical expertise.

1. Disable Unnecessary Startup Programs

The single most effective fix. Many applications add themselves to startup automatically, loading in the background and consuming resources before you even open anything.

  1. Press Ctrl + Shift + Esc to open Task Manager.
  2. Click the Startup apps tab.
  3. Sort by Startup impact (High first).
  4. Right-click any non-essential app and select Disable.

Good candidates to disable: Spotify, Discord, Teams (if not needed at boot), Skype, OneDrive (if you don't use it), and any game launchers.

2. Enable Fast Startup

Fast Startup is a hybrid shutdown mode that saves a snapshot of the system kernel to disk, allowing Windows to load faster on the next boot.

  1. Open Control Panel → Power Options → Choose what the power buttons do.
  2. Click Change settings that are currently unavailable.
  3. Check Turn on fast startup, then click Save changes.

Note: Fast Startup can occasionally cause issues with dual-boot setups or certain drivers. If you experience problems, simply disable it.

3. Upgrade to an SSD

If your PC still boots from a traditional spinning hard drive (HDD), upgrading to a Solid State Drive (SSD) is the single biggest hardware improvement you can make. Boot times can drop from over a minute to under 15 seconds. Even a budget SATA SSD offers a dramatic improvement over any HDD.

4. Adjust Your BIOS/UEFI Boot Order

If your BIOS is set to check multiple boot devices (DVD drive, USB, network) before your main drive, it adds unnecessary delay. Access your BIOS at startup (usually Del, F2, or F12) and ensure your main drive is listed first in the boot order. Also look for a Fast Boot option in BIOS and enable it if available.

5. Run a Malware Scan

Malware and adware often run at startup, consuming resources and slowing boot times. Run a full scan with Windows Security (Windows Defender) or a trusted third-party tool like Malwarebytes to check for and remove threats.

6. Keep Windows and Drivers Updated

Outdated drivers — especially graphics, storage, and chipset drivers — can cause delays during the boot process. Make sure Windows Update is current, and check your PC or motherboard manufacturer's website for the latest drivers.

7. Increase Virtual Memory (RAM Workaround)

If your PC has limited RAM, Windows uses the hard drive as virtual memory (pagefile), which is much slower. While adding more physical RAM is ideal, you can also manually adjust the pagefile size:

  1. Search for "Adjust the appearance and performance of Windows" in Start.
  2. Go to the Advanced tab → Change under Virtual Memory.
  3. Uncheck Automatically manage, set a custom size (e.g., 1.5× your RAM), and click Set.

8. Run the System File Checker (SFC)

Corrupted system files can cause slow or failed boots. The built-in SFC tool scans and repairs them automatically.

  1. Right-click the Start button and select Terminal (Admin) or Command Prompt (Admin).
  2. Type sfc /scannow and press Enter.
  3. Wait for the scan to complete — it may take several minutes.
  4. Restart your PC once finished.

Quick Summary

  • Disable high-impact startup apps in Task Manager
  • Enable Fast Startup in Power Options
  • Upgrade to an SSD if still on HDD
  • Optimise BIOS boot order
  • Scan for malware
  • Keep Windows and drivers updated
  • Adjust virtual memory settings
  • Run sfc /scannow to repair system files

Work through these steps one by one and reboot after each change — you'll likely identify the culprit quickly and enjoy noticeably faster startup times.