Windows performance

Computer feels slow after upgrading to Windows 11

A slowdown right after a Windows 11 upgrade is usually temporary background work (indexing, driver installs, first-run optimization) or older hardware running near its limits with a newer OS.

Difficulty
Easy
Time
20–40 minutes
DIY cost
$0
Pro cost
$60–$100

Symptoms

  • Slowdown started right after the Windows 11 upgrade finished
  • High disk or CPU usage in the days following the upgrade
  • Older PC just meeting or below Windows 11's minimum requirements
  • Specific apps or drivers behaving oddly since the upgrade

Likely causes

  • CommonBackground indexing and optimization tasks running after a major OS upgradeWindows reorganizes and re-indexes many things right after a big update, which settles within a day or two.
  • CommonOutdated drivers not yet updated for Windows 11Some drivers written for Windows 10 aren't fully optimized for 11 until updated.
  • PossibleOlder or borderline hardware struggling with Windows 11's requirementsWindows 11 has higher baseline requirements than 10.
  • PossibleLeftover files from the previous Windows version taking up spaceThis can affect available drive space temporarily.
  • PossibleNew Windows 11 features (widgets, animations) adding some overheadThese are usually minor but can matter on already-strained hardware.

What to do

  1. Give the PC a day or two after the upgrade for background optimization tasks to finish.
  2. Check Task Manager for any sustained high disk/CPU activity and let it complete if it looks like legitimate system work.
  3. Update all drivers, especially graphics and chipset, checking each manufacturer's site for Windows 11-specific versions.
  4. Run Disk Cleanup and select 'Previous Windows installation(s)' to free space once you're confident you won't roll back.
  5. Check Settings > System > About to confirm your hardware meets Windows 11's requirements comfortably.
  6. Disable widgets and other new visual features you don't use via Settings > Personalization > Taskbar.
  7. Check for any specific app compatibility issues by looking for pop-up warnings or crash reports since the upgrade.
  8. If the PC is right at the edge of Windows 11's minimum specs, some ongoing slowdown compared to Windows 10 may be expected.

Tools and parts

  • None required

When to call a pro

If slowness persists well after settling-in time and driver updates, a technician can assess whether the hardware is genuinely underpowered for Windows 11.

Safety

Generally low risk

Generally low risk for a careful person. Stop if anything looks different from what this guide describes.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.