Windows 11 Slow After Update? 9 Fixes That Actually Work (2026)
You installed a Windows 11 update, restarted your PC, and now everything feels sluggish. Apps take forever to open, the fan is working overtime, and even the Start menu stutters. Sound familiar?
You're not imagining it — Windows 11 running slow after an update is one of the most searched PC problems in the world. Updates can leave behind junk files, reset your settings, re-enable background apps, or install drivers that don't play nicely with your hardware.
The good news: in most cases, you can fix it yourself in under 30 minutes. Here are 9 proven fixes, ordered from quickest to most involved.
Why Does Windows 11 Get Slow After an Update?
Before jumping into fixes, it helps to know what's actually happening:
- Leftover update files (like the Windows.old folder) can eat 20–30GB of disk space
- Startup apps get re-enabled by the update, slowing your boot time
- New drivers may conflict with your hardware
- Background services like OneDrive sync and search indexing go into overdrive re-scanning your files
- Corrupted system files from an interrupted update cause random slowdowns
Now let's fix them one by one.
Fix 1: Do a Proper Restart (Not Shutdown)
This sounds too simple, but it fixes a surprising number of post-update slowdowns. Windows 11's Fast Startup feature means a regular "Shut down" doesn't fully clear your system memory — a Restart does.
- Click Start → Power → Restart
- After rebooting, open only the apps you actually need
If your PC feels snappier already, background processes piled up during the update were the culprit.
Fix 2: Install Pending and Optional Updates
It sounds ironic — fixing an update problem with more updates — but Microsoft frequently ships follow-up patches that resolve performance regressions from major updates. Driver updates hiding under "Optional updates" are especially important.
- Go to Settings → Windows Update → Check for updates and install everything
- Then go to Advanced options → Optional updates and install any driver updates
- Restart your PC
For a deeper dive into Microsoft's own recommendations, see Microsoft's official guide to improving PC performance in Windows.
Fix 3: Disable Unnecessary Startup Apps
Every app that launches at boot steals CPU and memory before you even start working. Updates often re-enable apps you previously turned off.
- Press Ctrl + Shift + Esc to open Task Manager
- Go to the Startup apps tab
- Look at the "Startup impact" column — disable anything marked High that you don't need immediately (chat apps, updaters, game launchers)
- Right-click → Disable
This single fix can cut boot times dramatically on older machines.
Fix 4: Free Up Disk Space (Delete Windows.old)
After a major update, Windows keeps your old installation in a folder called Windows.old — just in case you want to roll back. It can occupy 20GB or more, and a nearly-full drive slows everything down.
- Go to Settings → System → Storage
- Click Temporary files
- Check Previous Windows installation(s) and Temporary files, then click Remove files
Also turn on Storage Sense on the same page so Windows cleans junk automatically going forward. Aim to keep at least 15% of your drive free.
Fix 5: Pause OneDrive Syncing
Microsoft itself warns that OneDrive's background syncing can slow down your PC — especially right after an update when it's re-scanning your entire file library.
- Click the OneDrive cloud icon in the system tray (bottom-right)
- Click the gear icon → Pause syncing
- Choose 2, 8, or 24 hours
If your PC immediately feels faster, OneDrive was the bottleneck. You can leave syncing paused during heavy work and resume it later.
Fix 6: Turn Off Visual Effects
Windows 11's animations, transparency, and shadows look great but consume RAM and GPU power — painfully noticeable on PCs with less than 8GB of RAM.
- Press Win + S, type "Adjust the appearance and performance of Windows", and open it
- Select Adjust for best performance → Apply → OK
Your interface will look a bit plainer, but window transitions and overall responsiveness improve instantly. You can also choose Custom and keep just the effects you like.
Fix 7: Scan for Malware
Updates don't cause malware, but a compromised system often *feels* like a post-update slowdown. Worth ruling out:
- Go to Settings → Privacy & security → Windows Security
- Open Virus & threat protection → Quick scan
If anything is found, let Windows remove it and restart.
Fix 8: Repair Corrupted System Files (SFC + DISM)
If an update was interrupted (power cut, forced shutdown), system files may be corrupted. Two built-in tools fix this:
- Press Win + S, type cmd, right-click Command Prompt → Run as administrator
- Type
sfc /scannowand press Enter — wait for it to finish - Then type
DISM /Online /Cleanup-Image /RestoreHealthand press Enter - Restart your PC
These commands scan and repair Windows' core files. It takes 10–20 minutes but resolves mysterious slowdowns nothing else fixes.
Fix 9: Upgrade to an SSD (The Nuclear Option That Works)
Honest truth: if your PC still runs on a traditional hard drive (HDD), no software tweak will make it feel modern. Swapping to an SSD is the single biggest speed upgrade possible — boot times drop from minutes to seconds.
A 500GB SSD costs very little in 2026 and the difference is night and day. If you're not comfortable opening your PC, any repair shop can do the swap in under an hour.
When It's Time to Stop Fixing and Start Shopping
If you've tried everything above and your PC is still crawling, the hardware itself may be the limit. Signs it's time for an upgrade:
- Your PC has less than 8GB of RAM (and can't be upgraded)
- The processor is more than 6–7 years old
- You want Windows 11's AI features — check if your PC meets the Copilot+ requirements (most pre-2024 PCs don't)
Thinking of selling your old machine? Here's how to find out how much your computer is worth before you list it.
Frequently Asked Questions
Why is Windows 11 slower than Windows 10 on the same PC?
Windows 11 has higher visual and background-service overhead. On older hardware with HDDs or 4GB RAM, the difference is noticeable. The fixes above — especially disabling visual effects and startup apps — close most of the gap.
Should I roll back the update?
Only as a last resort. Go to Settings → System → Recovery → Go back (available for 10 days after a feature update). But you'll lose security patches, so try the fixes first.
Will resetting Windows help?
A clean install almost always fixes software-caused slowdowns, but it's the nuclear option — back up everything first. Try Fixes 1–8 before going here.
How do I stop this happening after every update?
Keep Storage Sense on, review startup apps monthly, and don't postpone updates for months — huge skipped-update jumps cause more problems than regular small ones.
Final Thoughts
A slow PC after a Windows 11 update is frustrating, but it's rarely permanent. Start with the quick wins — restart properly, trim startup apps, clear Windows.old — and work down the list. Nine times out of ten, one of these fixes brings your speed back.
Still stuck? Drop a comment describing your PC's specs and symptoms — happy to help troubleshoot.
