An update may be related to a slowdown, or it may be coincidence: Windows could still be finishing background work, a startup app may have changed, a driver may have updated, or storage may be running low. Find out what changed before trying to fix everything.
Use Start → Power → Restart (not Shut down and straight back on). Then open Settings → Windows Update and check for a pending restart, an update still downloading or installing, or more updates waiting. Let it finish and wait a few minutes before judging performance.
Press Ctrl+Shift+Esc, open the Processes tab and sort by CPU, Memory and Disk. Look for one process that stays on top: Windows Update activity, search indexing, antivirus scanning, a browser with many tabs, a game launcher updating, cloud sync or a newly installed background utility.
High usage right after an update is often temporary. If one third-party app stays at the top for a long time, investigate that app.
Software updates can re-enable startup entries. In Task Manager open Startup apps and look at launchers, chat clients, hardware utilities, cloud storage and RGB software. Disabling an entry does not uninstall the program. Identify it before disabling it.
Settings → System → Storage. A nearly full system drive makes maintenance and updates harder. See what actually uses the space; one unused game can outweigh months of temporary files. Be careful with Downloads, the Recycle Bin and Previous Windows installations - they can hold files you still need.
Windows Update can also deliver drivers. If the slowdown affects one area - graphics, Wi-Fi, audio, storage - open Device Manager, the device's Properties → Driver, and look at the provider, date and version. A driver that changed around the time the problem started is useful evidence.
Do not download a replacement from a third-party driver site. Prefer Windows Update, your PC maker's support page or the hardware maker's official page.
Unexpected high CPU, disk or network activity is not always an update. Run a scan under Windows Security → Virus & threat protection. A cleaner is not a substitute for a malware scan.
Settings → Windows Update → Advanced options → Optional updates may list driver updates. Do not install every one just because it exists, and avoid changing several things at once - troubleshooting is easier when you know which change made the difference.
Was the update the only change? Also think about a new application, a game update, a new driver, a browser extension, different antivirus software, a new startup app or a nearly full drive. If the PC slowed right after installing a specific application, that may matter more than the update.
A slow PC after an update is not evidence that the registry needs cleaning. Be wary of tools that blame thousands of registry entries. Look at measurable causes first: CPU, memory, disk activity, startup load, storage space and drivers.
Settings → System → Recovery may offer Fix problems using Windows Update, which reinstalls the current version of Windows while keeping apps, files and settings. Use it only after the simpler checks fail, and back up important files first.
Rain Cleaner (Windows 10/11, 64-bit) can help you inspect cleanup opportunities and system health information in one place, and it shows what it found before you decide what to remove. That helps if low storage, temporary data or startup clutter is part of the problem. It cannot honestly claim every slow PC is caused by junk: if Task Manager points to a driver, a failing app or heavy CPU use, investigate that instead. The Free version has no ads; Pro has a free 14-day trial (no card).
Last updated: 2026-10-01
Sometimes, for a while: background work, new drivers or re-enabled startup apps can all add load. It can also be a coincidence, so check what changed before acting.
No. A slowdown after an update is not evidence of registry problems. Check CPU, memory, disk, startup apps, storage and drivers first.
Rarely. The Windows Update repair option in Recovery can reinstall the current version while keeping your files and apps, after simpler checks fail.
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