A laptop suddenly slow on Windows 11 after an update is usually busy, not broken: for a day or two it indexes your files, installs drivers and syncs in the background. If it’s still slow after that, trim startup apps, change the power mode and update drivers, and if nothing helps you can roll back within 10 days.
Give it a day: post-update indexing
After a big update, Windows rebuilds its search index, finishes installing updates and re-syncs OneDrive. That eats the processor and disk.
- Leave the laptop on and plugged in for a few hours, ideally overnight.
- Restart it twice. Some updates only finish on the second restart.
- Open Task Manager (Ctrl + Shift + Esc) and sort by CPU and Disk. “Search Indexer”, “Antimalware Service” and “OneDrive” at the top usually means it’s still catching up.
Set your Wi-Fi as a metered connection (Settings > Network & internet > your network) if you’re on mobile bundles, so big downloads don’t drain them in the background.
Settings that slow Windows 11
- Startup apps: Settings > Apps > Startup. Switch off anything you don’t need the moment you log in.
- Visual effects: Settings > Accessibility > Visual effects. Turn off transparency and animation effects.
- Widgets and extras: Settings > Personalisation > Taskbar. Switch off Widgets and other items you don’t use.
- Search indexing: Settings > Privacy & security > Searching Windows. Choose Classic instead of Enhanced.
- OneDrive: pause syncing until the laptop settles, or choose fewer folders.
Drivers and power mode
- Power mode: Settings > System > Power & battery. Set Best performance when plugged in. Many laptops reset this to a power-saving mode after an update.
- Drivers: Settings > Windows Update > Advanced options > Optional updates. Also run your maker’s support app (such as Dell SupportAssist, HP Support Assistant or Lenovo Vantage) for graphics, chipset and storage drivers.
- Free space: keep at least 15–20% of the drive free. Settings > System > Storage > Cleanup recommendations clears old update files.
Some slowness is the hardware itself. An older ex-UK laptop with a hard drive or 4 GB RAM will feel slow on Windows 11 whatever you tweak; moving to an SSD and 8 GB RAM is the real fix. Our guide on why your laptop is so slow helps you tell which it is, and how to speed up a slow laptop covers the upgrades.
Roll back within 10 days
If the laptop was fine before and nothing above helps:
- Go to Settings > System > Recovery.
- Click Go back (or “Previous version of Windows”).
- Follow the prompts. Your files stay, but apps installed since the update may need reinstalling.
After 10 days the option disappears, because Windows deletes the old files. And note that Windows 10 no longer gets security updates, so going back is a stopgap; read upgrading Windows 10 to 11 before you decide.
Quick answers
It’s usually indexing files, finishing updates and syncing in the background for a day or two. If it stays slow, startup apps, power mode or old drivers are the common causes.
Disable startup apps, turn off visual effects and widgets, set power mode to Best performance, update drivers and free up disk space. On old hardware, add an SSD and more RAM.
