Windows 11 Slow Performance — 9 Fixes (2026)

A Windows 11 PC that used to feel quick and now takes a minute to reach the desktop is one of the most common complaints in computing — and one of the most fixable. Slowness almost always builds up gradually: programs that add themselves to startup, a power plan holding the processor back, background services that never stop writing to the disk, and a drive so full that Windows has nowhere left to work. Nothing has failed. The machine simply has too much running and too little room.

Reality check: Windows 11 usually slows down because of software build-up, not broken hardware. Find out first whether the processor, the memory, or the disk is the bottleneck — then fix that one thing. Guessing is what wastes an afternoon.

⚡ TL;DR — Top 3 Quick Actions

1. Open Task Manager with Ctrl + Shift + Esc and see which column is pinned high — CPU, Memory, or Disk.
2. Turn off the startup apps you do not need at boot, then restart.
3. Switch the power plan to High performance while the machine is plugged in.

First: Find the Bottleneck, Not the Symptom

“Slow” is three completely different faults wearing the same coat. A processor being held back at a low clock speed feels sluggish the moment you click something. Memory pressure feels like everything stalls once a few apps are open. A disk that cannot keep up makes the whole machine freeze for seconds at a time, usually worst just after logging in.

So spend two minutes in Task Manager before you change a single setting. Whichever of the three columns sits high while you are doing nothing tells you which fixes below are worth your time — and which ones were never going to help.

CPU stays high

• Sluggish the instant you click
• Fans loud, laptop warm
• Start with Fix 3 (power plan)
• Then Fix 7 (drivers)
• Then Fix 8 (system repair)

Memory stays high

• Fine at first, stalls later
• Browser tabs reload themselves
• Start with Fix 2 (startup apps)
• Then Fix 4 (background services)
• Then Fix 6 (page file)

Disk stays high

• Freezes for seconds at a time
• Worst just after signing in
• Most common on mechanical drives
• Start with Fix 5 (free up space)
• Then Fix 4, then Fix 8

📋 Table of Contents

1. Diagnose it in Task Manager first
2. Turn off unnecessary startup apps
3. Switch the power plan to High performance
4. Calm down background services
5. Free up disk space properly
6. Set a fixed page file size
7. Update graphics and storage drivers
8. Repair Windows system files
9. Reset or reinstall Windows — last resort
10. Quick Reference — all 9 fixes
11. Why Windows 11 slows down
12. The verdict — exact order
13. FAQ

The 9 Fixes (in order)

1Diagnose It in Task Manager First

DIAGNOSTICNO DATA LOSS2 min

Every fix below targets a different bottleneck, so this step decides which ones you actually need. Do it while the machine feels slow, not after a fresh restart.

Steps

1. Press Ctrl + Shift + Esc to open Task Manager.
2. If you only see a small window, click More details.
3. Open the Processes tab.
4. Click the CPU column and note anything that stays high for minutes on end.
5. Click Memory and look for anything using far more than you would expect.
6. Click Disk — a disk sitting near 100% while you are doing nothing is the classic sign of a struggling drive.
7. Right-click anything unfamiliar and choose Search online before assuming it is the culprit.

💡 Note: antivirus scans and Windows Update both look alarming here and both settle on their own. Give them an hour before changing anything.

✅ Verify it worked: you can now name the bottleneck — processor, memory, or disk — and jump straight to the fixes for it.

2Turn Off Unnecessary Startup Apps

HIGH IMPACTNO DATA LOSS3 min

Most programs quietly add themselves to startup when installed. Each one competes for the disk and processor during the first minute after sign-in, and then sits in memory all day whether you use it or not. This is the single biggest cause of a slow boot.

Steps

1. Press Ctrl + Shift + Esc and open the Startup apps tab.
2. Click the Startup impact column to sort the worst offenders to the top.
3. Right-click anything rated High or Medium that you do not need the moment you sign in, and choose Disable.
4. Usually safe to disable: chat apps, cloud storage clients, music and game launchers, and updater utilities.
5. Leave enabled: your security software, audio and touchpad drivers, and software for a wireless keyboard or mouse.
6. Restart and see how the first minute feels.

💡 Note: disabling a startup app does not uninstall it. You can still open it whenever you want — it simply stops loading itself.

✅ Verify it worked: the desktop becomes usable sooner after sign-in, and idle memory use in Task Manager is lower than before.

3Switch the Power Plan to High Performance

HIGH IMPACTNO DATA LOSS2 min

The Balanced plan deliberately keeps the processor at a low clock speed for anything it judges to be light work — which includes typing, browsing and opening apps. On a machine that already feels slow, that hesitation is very noticeable.

Steps

1. Click Start and search for Choose a power plan.
2. Select High performance. If you cannot see it, click Show additional plans.
3. Alternatively press Win + R, type powercfg.cpl and press Enter.
4. On a laptop, also open Settings → System → Power & battery and set the power mode to Best performance while plugged in.
5. Switch back to Balanced when you are running on battery.

⚠️ Warning: High performance shortens battery life noticeably and makes laptops run warmer. Use it plugged in, not on the move.

✅ Verify it worked: apps open with less delay after the click, and typing no longer lags behind you.

4Calm Down Background Services

HIGH IMPACTNO DATA LOSS3 min

SysMain tries to speed things up by loading apps into memory before you ask for them. On a machine with plenty of memory and a fast solid-state drive that is helpful. On a machine that is short of memory or still using a mechanical hard drive it can do the opposite, keeping the disk busy constantly. It is worth testing, and it is completely reversible.

Steps

1. Press Win + R, type services.msc and press Enter.
2. Find SysMain in the list, right-click it and choose Properties.
3. Set Startup type to Disabled, click Stop, then OK.
4. If you also want less background chatter, do the same for Connected User Experiences and Telemetry.
5. Restart and watch the Disk column in Task Manager while the machine is idle.

💡 Note: the only trade-off is that the first launch of an app may be a little slower. If you see no improvement, set SysMain back to Automatic — nothing is lost either way.

✅ Verify it worked: disk activity at idle is much lower, and the machine stops freezing in the first minutes after sign-in.

5Free Up Disk Space Properly

HIGH IMPACTNO DATA LOSS5 min

Windows needs free room to write temporary files, updates and the page file. When the drive is nearly full every save and every update becomes slower, and updates start failing outright. Use Windows’ own tools rather than a third-party cleaner.

Steps

1. Open Settings → System → Storage and click Temporary files.
2. Tick the safe categories offered — temporary files, delivery optimisation files, thumbnails — then click Remove files.
3. Turn Storage Sense on and set it to run every week.
4. Press Win + R, type %temp%, select everything and delete it. Skip anything that says it is in use.
5. Open Settings → Apps → Installed apps, sort by size, and uninstall what you genuinely no longer use.

💡 Note: aim to keep roughly a tenth of the drive free at all times. Below that, Windows has nowhere to work and everything suffers.

✅ Verify it worked: Settings shows the extra free space, saving files feels immediate again, and updates install without stalling.

6Set a Fixed Page File Size

MEDIUM IMPACTNO DATA LOSS5 min

When memory runs out, Windows spills the overflow onto the drive in a file it resizes as it goes. On a machine short of memory that resizing happens constantly and shows up as short freezes. Fixing the size removes that overhead.

Steps

1. Click Start and search for Adjust the appearance and performance of Windows.
2. Open the Advanced tab, then under Virtual memory click Change.
3. Untick Automatically manage paging file size for all drives.
4. Select the C: drive and choose Custom size.
5. Set the initial size to about one and a half times your installed memory, and the maximum to about three times it. With 8 GB that is roughly 12288 MB and 24576 MB.
6. Click Set, then OK, and restart.

⚠️ Warning: never switch the page file off completely. Some programs will refuse to start and Windows can become unstable.

💡 Note: if the drive is a mechanical hard disk, this only softens the problem. Moving to a solid-state drive is the real cure, and it is the single biggest upgrade an older machine can get.

✅ Verify it worked: with several apps open, the short freezes stop and switching between windows stays smooth.

7Update Graphics and Storage Drivers

MEDIUM IMPACTNO DATA LOSS15 min

An out-of-date graphics driver makes the processor do work the graphics chip should be handling, which shows up as stuttering while scrolling or watching video. Windows Update does not always offer the newest version.

Steps

1. Run Settings → Windows Update and install everything, including optional driver updates.
2. Press Win + X, open Device Manager, expand Display adapters, right-click your graphics device and choose Update driver.
3. For the newest version, download it from your graphics chip maker’s own support site, or from your laptop maker’s support page for your exact model.
4. While you are there, check Disk drives and Storage controllers for updates too.
5. Restart after installing.

⚠️ Warning: only ever download drivers from the manufacturer’s own website. Driver bundles from download portals are a common source of unwanted software.

✅ Verify it worked: scrolling and video playback are smooth again, and processor use stays lower while you do them.

8Repair Windows System Files

MEDIUM IMPACTNO DATA LOSS20 min

If slowness comes with odd behaviour — settings pages that will not open, updates that fail, random errors — some of Windows’ own files are probably damaged. Windows includes two built-in repair tools for exactly this, and neither touches your documents.

Steps

1. Click Start, search for Command Prompt, right-click it and choose Run as administrator.
2. Run the component repair first. It needs an internet connection and can take up to twenty minutes: DISM /Online /Cleanup-Image /RestoreHealth
3. Wait for it to report that the operation completed successfully.
4. Then run the file checker: sfc /scannow
5. Let it finish without closing the window, then restart.

💡 Note: run them in this order. The first tool repairs the reference copy that the second one uses to fix your installation.

✅ Verify it worked: after the restart the random errors stop, settings pages open normally, and updates install cleanly.

9Reset or Reinstall Windows — Last Resort

LAST RESORTBACK UP FIRST90 min

After years of installing and removing software, some machines carry more clutter than any repair tool can clear. Starting again genuinely works — but try the gentler option first, because it keeps your files.

Steps

1. Copy your documents, photos and downloads to an external drive or cloud storage, and write down any licence keys you will need.
2. Try the gentle route first: Settings → System → Recovery → Reset this PC → Keep my files. This reinstalls Windows and removes installed programs but leaves your own files alone.
3. Use the machine for a day. If it is quick again, stop here.
4. If it is still slow, do a full clean install using the official media creation tool from Microsoft’s own download page.
5. Afterwards, reinstall only the programs you actually use rather than restoring an old backup image.

⚠️ Warning: a full clean install erases everything on the C: drive. Do not start it until your backup is finished and you have checked the files are readable.

✅ Verify it worked: the machine boots quickly and sits quiet at idle. If a freshly installed Windows is still slow, the limit is the hardware — more memory or a solid-state drive is the answer.

Quick Reference — All 9 Fixes

#	Fix	Impact	Time	Files safe?	Best for
1	Diagnose in Task Manager	Diagnostic	2 min	Yes	Everyone — start here
2	Turn off startup apps	High	3 min	Yes	Slow boot, memory pressure
3	High performance power plan	High	2 min	Yes	Sluggish clicks and typing
4	Calm background services	High	3 min	Yes	Constant disk activity
5	Free up disk space	High	5 min	Yes	Nearly full drive
6	Fixed page file size	Medium	5 min	Yes	Short freezes with apps open
7	Update graphics and storage drivers	Medium	15 min	Yes	Stuttering while scrolling
8	Repair Windows system files	Medium	20 min	Yes	Errors and failed updates
9	Reset or reinstall Windows	Last resort	90 min	Back up first	Nothing else worked

Why Windows 11 Slows Down — The Real Causes

A computer that has been in daily use for a few years is running a very different collection of software from the one it left the shop with. Understanding what actually accumulates makes the fixes above make sense, and makes it much easier to keep the machine quick once you have it back.

Startup and background clutter

Almost every program you install asks to start with Windows, and most never ask again. Individually none of them matters. Together they turn the first minute after signing in into a scramble for the disk and the processor, and they hold on to memory for the rest of the day whether you open them or not.

The processor being held back on purpose

Power settings deliberately keep the processor at a low speed for work Windows judges to be light, then raise it when it decides you need more. On an already-tired machine that delay is exactly what makes clicks and keystrokes feel a beat behind you, and it is why changing one setting can transform how the whole system feels.

Not enough memory, so the drive takes the strain

When memory fills up, Windows moves the overflow onto the drive. That is far slower than real memory, so the machine keeps working but everything stalls in bursts. It is the reason a machine can be perfectly quick with two apps open and unusable with six.

A mechanical hard drive under a modern Windows

Windows 11 assumes a solid-state drive. On a spinning hard disk, the background indexing, updating and preloading it does in the first minutes after sign-in can saturate the drive completely. This is the single most common reason an otherwise capable machine feels broken, and the only complete cure is replacing the drive.

Damaged system files and ageing drivers

Interrupted updates and sudden shutdowns can leave Windows’ own files damaged, which shows up as random slowness and errors rather than an obvious fault. Old graphics drivers cause a similar pattern by pushing work onto the processor that should never have been there. Both are repaired rather than replaced, which is why they sit late in the list but before any thought of reinstalling.

How to Keep It Fast Long-Term

• Restart properly once a week. Shutting the lid is not the same as a restart, and Windows clears a lot of accumulated state when it boots.
• Keep about a tenth of the drive free. Check it monthly rather than waiting for a warning.
• Review the startup list every few months. New programs add themselves quietly.
• Run one security program, not two. Two real-time scanners will fight each other and slow everything down.
• Install updates rather than postponing them forever. Half-finished updates cause more problems than finished ones.
• Spend on the drive before the whole machine. Moving to a solid-state drive, and adding memory if you have very little, makes an old computer feel new for a fraction of the cost.

Common Mistakes That Make It Worse

• Installing a “PC booster” or registry cleaner. They rarely help, often bundle extra software, and can break working settings.
• Turning off your security software to gain speed. An infected machine is far slower than a protected one.
• Deleting system folders you found in a video. Stick to the built-in storage tools, which only remove what is genuinely safe.
• Changing ten settings at once. You will never know which one helped, or which one caused the new problem.
• Switching the page file off. It causes crashes rather than speed.
• Buying a new computer before checking the drive. An older machine with a mechanical drive is usually a cheap upgrade, not a write-off.

✅ The Verdict — Exact Order to Follow

1. Always start with Fix 1. Two minutes in Task Manager tells you whether this is a processor, memory, or disk problem.
2. Slow boot or stalling with apps open? Fix 2, then Fix 4, then Fix 6.
3. Sluggish the moment you click? Fix 3, then Fix 7.
4. Freezing for seconds at a time? Fix 5, then Fix 4, then Fix 8.
5. Slow only since an update? Wait 48 hours, then check the power plan has not reset itself (Fix 3).
6. Nothing worked? Fix 8, then Fix 9 — and if a freshly installed Windows is still slow, upgrade the drive or add memory.

Frequently Asked Questions

Why did Windows 11 get slow right after an update?

Windows spends a day or two after a major update re-indexing files and reinstalling drivers in the background, so give it 48 hours before worrying. If it is still slow after that, check whether the power plan reset itself to Balanced, then work through Fixes 2 and 7.

Do startup apps really make that much difference?

Yes, especially on the boot itself. They all compete for the drive at the same moment, and on a mechanical hard disk that is what turns a thirty-second boot into a two-minute one. Disabling them is instant and completely reversible.

Is it safe to disable SysMain?

It is safe and reversible. On a machine with plenty of memory and a solid-state drive, leave it on. On one that is short of memory or using a mechanical drive, turning it off often stops the constant disk activity. If you notice no benefit, set it back to Automatic.

How much memory does Windows 11 really need?

4 GB is painful for everyday use. 8 GB copes with browsing and documents but struggles once several apps are open. 16 GB is comfortable for most people, and more only helps with video editing or games. With 8 GB, Fixes 2, 4 and 6 matter most.

Will any of this delete my files?

Fixes 1 to 8 do not touch your documents, photos or programs’ data at all — they change settings, clear temporary files, and repair Windows’ own files. Only Fix 9 removes anything, and the gentler “Keep my files” option there is designed to preserve your personal data.

Are PC cleaner apps worth installing?

Generally not. Everything useful they do — clearing temporary files, managing startup items — is already built into Windows and covered by Fixes 2 and 5. Many bundle additional software or nag for a subscription, which leaves the machine slower than before.

🔗 Related Fixes

• No sound as well? Windows 11 Audio Not Working — 9 Fixes
• Black screen on boot? Windows 11 Black Screen — 7 Fixes
• Taskbar frozen? Windows 11 Taskbar Not Working — 9 Fixes
• Screen flickering too? Laptop Screen Flickering — 9 Real Fixes

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