Most slowdowns after a Windows 11 update are temporary. The update leaves a pile of background work behind, such as search reindexing and component cleanup. Some slowdowns last longer because of a reset setting, an older driver or, rarely, a buggy update. Below is how to tell which one you have, and what to do about it, in an order that avoids risky guesses.
TL;DR
- Leave the PC on and idle for about 30 minutes, then restart. Many post-update slowdowns are background tasks finishing.
- If it is still slow after a few hours, open Task Manager and find out what is using CPU, memory or disk before changing anything.
- Check for driver updates, startup apps that came back, and reset power or visual settings.
- If a specific update is the cause, check Microsoft's known-issues page before you uninstall anything.
- Change one thing at a time and keep a way back.
Table of Contents
- Why Windows 11 feels slow right after an update
- How long should the slowdown last?
- Step 1: See what is actually using your resources
- Step 2: Install pending updates and check drivers
- Step 3: Take back startup and background apps
- Step 4: Recheck power mode and visual effects
- Step 5: Free disk space and scan for malware
- Step 6: Repair a stuck or corrupted update
- Is the latest update a known problem?
- Our perspective: measure first, change second
- Where Tempered fits
- A sensible order to work through
- FAQ
- Sources
Why Windows 11 feels slow right after an update
An update does not end when the restart finishes. How-To Geek explains that post-update tasks such as search reindexing, file optimization, component updates and security changes can spike CPU, RAM or disk use. During that window the PC can feel sluggish even though nothing is broken.
The usual causes fall into four groups:
- Background work. Indexing, optimization and follow-up updates compete with your apps for resources.
- Older or generic drivers. XDA-Developers notes that Windows Update may leave generic or older drivers in place, including graphics and chipset drivers. These can lack the performance fixes the hardware vendor ships.
- Reset settings. The same XDA piece explains that major version upgrades often reset performance and interface configurations to defaults, as a stability measure. You may read that as a regression when your own tweaks were simply wiped.
- A real bug. Rare, but it happens. Some updates contain genuine bugs that affect specific hardware, and these are usually fixed in later official releases.
How long should the slowdown last?
Give it a fair chance first. The guidance from How-To Geek is to leave the PC idle for about 30 minutes, then restart. If it is still slow after a few hours, treat that as a signal to investigate rather than keep waiting.
One exception is search indexing. XDA-Developers reports that if the index becomes corrupted, Windows may need to rebuild it from scratch, which can take hours or even days. During a rebuild you may see steady disk activity from search-related processes. That is a reason to check Task Manager (next section) before assuming something is wrong.
Plugging in a laptop while it finishes this work is a sensible step, since heavy background tasks run happily on power and drain a battery fast.
Step 1: See what is actually using your resources
Do not start with registry cleaners or random tweaks. Start by measuring. Microsoft's performance tips point to Task Manager for monitoring CPU, memory and disk use, and its Processes tab for reviewing what each app consumes.
Open Task Manager with Ctrl+Shift+Esc and read it like this:
| What you see | What it usually means | Next move |
|---|---|---|
| Disk at or near 100% for a long time, search or update processes on top | Indexing or update work still running | Wait, plug in, restart after a few hours |
| CPU high with one app on top | That app, or its driver, misbehaves after the update | Update or reinstall the app |
| Memory nearly full, many apps listed | Too many background apps or startup items | Trim startup and background apps |
| Everything looks calm but games stutter | Likely graphics driver or power mode | Check driver and power settings |
Write down what you see before and after each change. If a fix does nothing, you will know.
Step 2: Install pending updates and check drivers
Microsoft recommends checking for Windows updates and optional driver updates as a first move. A slowdown caused by one release is sometimes fixed by the next, so open Windows Update and install anything pending.
Then look at drivers. Graphics and chipset drivers matter most for how a PC feels. Based on the XDA-Developers guidance:
- If the slowdown started right after an update, rolling back or updating to a newer driver may help.
- A clean uninstall and reinstall of the graphics or chipset driver can also help.
- Get drivers from your hardware maker or PC manufacturer, because the version Windows Update installed may be generic.
If you are a gamer, this is the first place to look. Stutter, low frame rates and long load times after an update often trace back to the graphics driver. Our guide to optimizing Windows 11 for gaming covers the settings that matter once the driver is current.
Step 3: Take back startup and background apps
Updates can change what launches at sign-in, and new software installed alongside them can add more. Microsoft's guidance is to use the Startup apps tab in Task Manager to identify and disable apps you do not need at startup.
Go through the list and disable anything you do not need in the first minute after sign-in. If you are unsure about an item, leave it alone and search its name first. Disabling a startup entry does not uninstall the program, and you can turn it back on.
Three guides go deeper on this:
- Delay startup apps safely for apps you want, just not immediately.
- Startup impact fixes in Task Manager for reading the impact column.
- Safe fixes to cut background processes for what runs after you log in.
If boot itself is the problem, the speed-up boot walkthrough and the note on Fast Startup and boot impact are worth reading before you toggle anything.
Step 4: Recheck power mode and visual effects
Because updates can reset settings, confirm your power and appearance choices still match what you want. Microsoft's tips list two relevant options: adjusting visual effects for best performance, and choosing the Best performance power mode if power use is not a concern.
On a desktop, Best performance costs you little. On a laptop it will shorten battery life, so use it plugged in. Our page on Windows power mode explains the trade-off.
Step 5: Free disk space and scan for malware
Two more items from Microsoft's list are quick and safe. First, free up disk space with Storage Sense. Big feature updates can leave old files behind, and a nearly full system drive slows everything. Our Disk Cleanup guide for Windows 11 shows what is safe to remove.
Second, run a scan with Windows Security. Microsoft lists this as a recommended diagnostic step because malicious software can consume CPU and disk resources. It is unlikely to be the cause if the slowdown began exactly at the update, but it takes a few minutes and rules it out.
Step 6: Repair a stuck or corrupted update
If Windows Update itself behaves oddly, such as repeated failures or an update that never finishes, Microsoft's update troubleshooting page describes two tools:
- The Windows Update troubleshooter, available through the Get Help app, can diagnose and fix common update-related errors.
- Clearing the Windows Update cache, which means stopping the Windows Update service and deleting the files in the SoftwareDistribution folder under C:\Windows.
Follow Microsoft's steps exactly for the cache method. Deleting files by hand in system folders is the sort of step to take only after the simpler ones fail, and only if you are comfortable with it.
Is the latest update a known problem?
Sometimes it is not you. Before you spend an evening troubleshooting, check Microsoft's Windows 11 version 26H2 known issues page. As of October 21, 2026, it lists known issues and their status. One entry describes a problem after KB5124010 that could make some apps that decode AC-3 audio, games included, close unexpectedly. It was resolved in KB5127648.
Media reports describe broader complaints too. TechRadar reported that the September preview update, KB5124010, caused slow booting, app crashes and general sluggishness for some users.
Note the word "preview." According to the same report, people who turn on the setting to get the latest updates as soon as they are available may receive preview updates automatically, and those can carry bugs. If you want fewer surprises, leave that setting off and let updates arrive on the regular schedule.
When to uninstall an update or roll back a driver
TechRadar advises caution with optional preview updates, noting that uninstalling the patch is sometimes the only available fix. Uninstall an update only when all of these are true:
- The slowdown began right after that update, not days later.
- You waited out background work and restarted.
- Task Manager and driver checks did not explain it.
- The known-issues page or reliable reports point to the same update.
If you uninstall, note the update number first, and pause updates only as long as you need to. A security update you skip leaves you exposed, so reinstall once a fix is out. For a driver, rolling back is less drastic and easier to reverse, so try it before removing an update.
Our perspective: measure first, change second
We see the same pattern again and again. A PC feels slow after an update, and the first instinct is to run something that promises to speed it up. Many tools in that space lean on vague scores, registry cleaning and automatic tweaks that nobody asked for. If the real cause was an indexing job or an old driver, those tweaks do nothing, and you cannot tell what they changed.
We think the better method is the one in this article. Find the actual constraint, whether that is disk, CPU, memory, a driver or a startup load. Make one change you understand. Check whether it helped. Keep a clear way to reverse it. That is also how we built Tempered: it looks at live hardware metrics, proposes specific changes with a plain-language reason and an expected outcome, and applies nothing without your approval. Every change is tracked with a one-click Undo.
The update itself is rarely the villain. Often it only exposed something that was already costing you performance, like too many startup apps or a driver that was never current. Fixing that makes the PC faster than before the update, not just back to normal.
— Ian
Where Tempered fits
If you would rather not dig through Task Manager, drivers and settings by hand, Tempered does the diagnosis for you on Windows 10 and 11. It reads CPU, RAM, GPU, disk and uptime, explains what it finds in plain language, and manages background processes and startup options. It also offers a Game Mode and is anti-cheat safe, which matters if you game. It does not clean the registry or invent problems, and it does not need an AI API key.
The Free plan includes a limited number of AI scans, which is enough to see whether your slowdown has a measurable cause. Paid plans raise the scan limits and unlock premium features: Torque starts at $5.99 per month and Torque Max at $12.99 per month. See the plans and pricing for what each includes, or learn more at the Tempered homepage.
A sensible order to work through
If you want one checklist, use this:
- Plug in, leave the PC idle for 30 minutes, restart.
- Install pending Windows updates and optional driver updates.
- Open Task Manager and note what is using resources.
- Disable startup apps you do not need.
- Confirm power mode and visual effects.
- Free disk space and run a Windows Security scan.
- Check the release-health page for your Windows 11 version.
- Roll back a driver, then consider uninstalling the update only as a last step.
Microsoft also recommends its PC Manager app for cleaning up storage, managing startup apps and optimizing performance, if you want a first-party option.
FAQ
How long does Windows 11 stay slow after an update?
Often 30 minutes to a few hours while background tasks finish. How-To Geek suggests an idle period of about 30 minutes, then a restart, and further investigation if it is still slow after a few hours. A corrupted search index can take much longer to rebuild.
Is the latest Windows 11 update causing problems?
Possibly, for some hardware. Microsoft lists confirmed issues and their status on the release-health page for your version, and media have reported slowdowns tied to a September preview update. Check that page before you uninstall anything.
Why are my games slower after a Windows update?
The graphics driver is the most common suspect, because Windows Update may leave a generic or older one in place. Update it from the manufacturer, or roll back to the previous version, then recheck your power mode.
Should I uninstall the update?
Only after simpler fixes fail and the timing and known-issues page point to that update. Uninstalling is sometimes the only fix for a faulty preview update, but it also removes any security fixes it carried, so plan to reinstall once a fix is available.
Do PC optimizers help after an update?
It depends on the tool. Look for one that measures first, explains each change, asks for approval and lets you undo it. Avoid anything that applies changes silently or promises results from registry cleaning.
Sources
- Windows update slowing down your PC? Quick fixes (How-To Geek)
- 5 reasons your PC can feel slow after a Windows update (XDA-Developers)
- Windows 11, version 26H2 known issues and notifications (Microsoft Learn)
- Windows 11's latest update has a game-breaking bug (TechRadar)
- Tips to improve PC performance in Windows (Microsoft Support)
- Troubleshoot problems updating Windows (Microsoft Support)