Laptop slow after a Windows update? How to fix it

Why it happens

Installing the update is only part of the job. After the restart, Windows keeps working in the background for a while:

• Finishing the install and cleaning up the old versions of files it replaced.
• Rebuilding the search index, so Start menu and File Explorer searches work.
• Re-optimizing apps and programs, like .NET programs, for the new version.
• Running a Microsoft Defender scan with new definitions.
• Re-syncing OneDrive, especially if the update reset any of its settings.

All of that hits the drive and the processor at once. On a newer laptop with an SSD you might barely notice. On an older one with a spinning hard drive and 4 GB of memory, it can make the machine feel broken for an afternoon.

It also matters which kind of update it was. The monthly security updates are small and usually settle in quickly. The yearly feature updates (like a move from one Windows 11 version to the next) are much bigger, and they're the ones most likely to change settings or drivers.

Give it time, then restart properly

Leave the laptop on, plugged in, and awake for an hour or two. Don't let it sleep, since background work pauses when it does. Then restart it from Start → Power → Restart.

Use Restart, not Shut down. With Fast Startup on, which is the default on most PCs, Shut down saves part of Windows to the drive and loads it back the next time, so it doesn't start completely fresh. Restart does.

If it's back to normal after that, you're done. Most slowdowns after an update end right here.

See what's busy in Task Manager

Press Ctrl + Shift + Esc, click More details if you need to, and sort the Processes tab by CPU, then by Disk. The usual suspects after an update:

If nothing looks busy and it's still slow, my 10-minute slow PC diagnosis goes through the rest of Task Manager step by step.

Check what the update changed

Big updates sometimes put things back the way Microsoft prefers them. Worth a look:

• Startup apps: Settings → Apps → Startup (or the Startup tab in Task Manager). Turn off anything you don't need running all the time.
• Power mode: on Windows 11, Settings → System → Power & battery → Power mode. Set it to Best performance while plugged in. A laptop stuck in battery saver feels slow everywhere.
• OneDrive folder backup: an update or a new prompt may have turned on backing up your Desktop, Documents, and Pictures. If it's uploading years of photos, that's your slowdown. It will finish eventually, or you can pause it.
• Visual effects: Settings → Accessibility → Visual effects. Turning off animation and transparency effects makes an older laptop feel snappier.

Roll back a bad driver

Windows Update installs drivers too, and sometimes it swaps the one your laptop's maker provided for a more generic version. Signs of a driver problem: choppy video or scrolling, a screen that flickers, Wi-Fi that drops, or a fan that's suddenly louder.

1. Right-click the Start button and open Device Manager.
2. Open the category that's acting up. Graphics is under Display adapters, and Wi-Fi is under Network adapters.
3. Right-click the device, choose Properties, then the Driver tab.
4. Click Roll Back Driver if it's available, then restart.

Even better, get drivers straight from your laptop's maker. Lenovo Vantage, Dell SupportAssist, and HP Support Assistant check for the right ones for your exact model.

Clear out leftover update files

Updates leave old files behind, and a nearly full drive slows everything down. Open Settings → System → Storage → Temporary files (on Windows 10, Settings → System → Storage), check Windows Update Cleanup and Delivery Optimization Files, and remove them. Leave Downloads unchecked unless you've looked through that folder first.

Aim to keep at least 15 to 20 GB free. Windows needs room to work, and the next big update needs even more.

Uninstall the update

If it started right after an update and nothing above helped, you can remove it. Updates carry security fixes, so treat this as a last resort and only remove the most recent one.

A monthly update

• Windows 11: Settings → Windows Update → Update history → Uninstall updates.
• Windows 10: Settings → Update & Security → Windows Update → View update history → Uninstall updates.

Pick the newest one by date, uninstall it, and restart.

A feature update

For about 10 days after a feature update, Windows 11 keeps the previous version. Go to Settings → System → Recovery and choose Go back. (Windows 10 doesn't get feature updates anymore, since 22H2 was its last version, so this only applies to Windows 11.) Your files stay, but programs installed since the update may need reinstalling. After the 10 days the option disappears.

Then pause updates for a week or two from the Windows Update page, so it doesn't reinstall right away. Microsoft usually fixes widespread problems in the next month's update. Don't leave updates paused for long, though. That's how PCs end up missing important security fixes. If you're still on Windows 10, make sure it's enrolled in free ESU updates so you keep getting them at all.

Repair Windows system files

If an update was interrupted, by a power cut or a dead battery, some system files can end up damaged. Windows has two built-in repair tools. Search Start for cmd, choose Run as administrator, and run these one at a time:

Each can take 10 to 30 minutes. Restart when both are done.

If it's an older laptop with a hard drive

Here's the honest part: on a laptop with a spinning hard drive, every Windows update will feel like this. Updates read and write thousands of small files, which is the thing hard drives are worst at. Open Task Manager's Performance tab and click Disk 0. If it says HDD, that's your real problem.

An SSD is the fix, and it's usually the best $100 you can spend on an old laptop. Here's whether to upgrade the SSD or RAM first, and my full guide to speeding up an old PC. If the laptop can't run Windows 11 and is getting slower with every Windows 10 update, it may be time to look at Linux or a refurbished replacement.