How to fix Windows 11 running slow performance after upgrading?

Is your Windows 11 PC running slow, taking too long to start, or freezing when you open applications? You are not alone. Even relatively new computers can experience performance problems because of unnecessary startup apps, limited storage, high CPU usage, background processes, outdated drivers, or Windows update issues.

The good news is that you may not need a new computer to solve the problem. By identifying the cause and applying the right fixes, you can often make Windows 11 faster and more responsive.

In this guide, you will learn how to fix Windows 11 running slow using 12 practical methods, including disabling unnecessary startup programs, freeing up disk space, reducing background activity, checking system resources, and repairing Windows system files.

If you want to improve your computer’s overall responsiveness, explore our guide to Windows 11 performance optimization tips for additional ways to optimize your system.

These solutions apply to desktop PCs and laptops, including systems with HDDs, SSDs, and limited RAM.

Why Is Windows 11 Running Slow?

Before applying fixes, it helps to understand why your computer has become sluggish. The cause may be software-related, hardware-related, or a combination of both.

Common reasons Windows 11 runs slowly include:

• Too many applications launching during startup.
• High CPU, RAM, or disk usage.
• Insufficient free storage space.
• Unnecessary background applications.
• Outdated Windows updates or device drivers.
• Malware or potentially unwanted software.
• Overheating or power-saving settings.
• A traditional hard disk drive (HDD) that struggles with modern workloads.
• Corrupted Windows system files.
• Insufficient memory for the applications you use.

Quick tip: Press Ctrl + Shift + Esc to open Task Manager. Check the CPU, Memory, and Disk columns to see whether a particular resource is consistently under heavy load. This can help you choose the right solution instead of trying every fix randomly.

How to Fix Windows 11 Running Slow

Follow the methods below in order, starting with the simplest and safest solutions.

1. Restart Your Computer

Restarting your PC is one of the easiest ways to fix temporary Windows 11 performance problems.

When you use your computer for long periods, applications and background processes may consume memory or become unresponsive. A restart closes these processes and starts Windows with a fresh session.

Steps to restart Windows 11:

1. Save your open documents and close your applications.
2. Click the Start button.
3. Select the Power icon.
4. Click Restart.
5. Wait for Windows to load, then check whether performance has improved.

Choose Restart, rather than relying only on shutting down and turning the PC back on, because Fast Startup can affect the shutdown-and-startup sequence on some systems.

If your computer remains slow after restarting, continue with the next method.

2. Disable Unnecessary Startup Applications

Many applications automatically launch when Windows starts. Too many startup programs can increase boot time and continue consuming CPU and memory in the background.

Disabling applications you do not need immediately after startup can make Windows 11 start faster.

How to disable startup apps:

1. Press Ctrl + Shift + Esc to open Task Manager.
2. Select Startup apps from the sidebar.
3. Review the list of applications.
4. Check the Startup impact column.
5. Right-click an unnecessary application.
6. Select Disable.

Prioritize applications with a high startup impact that you do not need immediately.

Do not disable security software, essential hardware utilities, or unfamiliar system components without checking their purpose. Disabling a startup app generally prevents automatic launching; it does not uninstall the application.

3. Check CPU, RAM, and Disk Usage

If Windows 11 is lagging or freezing, an application may be consuming too many system resources.

Task Manager helps you identify resource-intensive applications.

Steps to check resource usage:

1. Press Ctrl + Shift + Esc.
2. Open the Processes tab.
3. Click the CPU column to sort processes by CPU usage.
4. Repeat for Memory and Disk.
5. Identify applications that consistently consume unusually high resources.

If a browser has dozens of open tabs, for example, it may use substantial memory. Closing unused tabs can help. If a particular application is repeatedly using excessive CPU, update it or investigate its background activity.

You can select a nonessential application and click End task if it is unresponsive. Avoid ending unfamiliar Windows processes, and save your work before closing applications.

If CPU, Memory, or Disk usage remains unusually high when you are not doing much, investigate the responsible process rather than assuming that Windows itself is the problem.

4. Free Up Storage Space

A nearly full system drive can contribute to poor performance, especially when Windows has limited room for temporary files, updates, and other operations.

Removing unnecessary files can help restore available storage.

How to clean up storage in Windows 11:

1. Press Windows + I to open Settings.
2. Select System.
3. Click Storage.
4. Review Temporary files, Installed apps, and other storage categories.
5. Select the files you no longer need.
6. Confirm the cleanup.

You can also enable Storage Sense to automatically remove certain unnecessary files.

Important: Review the selected categories before deleting anything. Your Downloads folder and Recycle Bin may contain files you want to keep.

For additional storage management, consider uninstalling unused applications and moving large personal files to another drive or a trusted cloud storage service.

5. Install Windows Updates

Outdated Windows components can sometimes cause performance problems, compatibility issues, or software bugs.

Installing available updates may resolve known problems and improve system stability.

Steps to update Windows 11:

1. Open Settings.
2. Select Windows Update.
3. Click Check for updates.
4. Install appropriate available updates.
5. Restart your computer if prompted.

Check for optional driver updates under the advanced Windows Update options when troubleshooting a specific hardware issue.

Updates do not always make a computer faster. If the slowdown began immediately after a particular update, investigate that update or any related driver issue before making additional changes.

6. Scan for Malware and Unwanted Software

Malware, adware, and unwanted applications can consume system resources, display unwanted advertisements, or cause unusual computer behavior.

Windows Security includes built-in protection that you can use to scan your PC.

How to run a malware scan:

1. Open the Start menu.
2. Search for Windows Security.
3. Select Virus & threat protection.
4. Click Quick scan.
5. Follow any recommended actions.

If you continue to notice unexplained slowdowns, unexpected pop-ups, or suspicious processes, consider running a Full scan.

Keep your security software and protection definitions updated. Avoid installing unknown PC cleaners or utilities that promise unrealistic performance improvements.

7. Disable Unnecessary Background Applications

Some applications continue running background tasks even when you are not actively using them. Depending on the application, this can consume memory, CPU resources, or network bandwidth.

You can reduce unnecessary background activity by changing application settings, disabling unneeded startup entries, and closing applications you do not use.

What to do:

1. Open Settings.
2. Select Apps, then Installed Apps.
3. Find an application you rarely use.
4. Open its additional options, if available.
5. Look for background app permissions and choose an appropriate setting, such as Never, when supported.

Not every desktop application offers the same background permission controls. For apps without this option, use their own settings or Task Manager to manage unnecessary activity.

Avoid disabling background activity for applications that you rely on for notifications, syncing, security, or essential system functions.

8. Adjust Visual Effects for Better Performance

Windows 11 includes animations, transparency, shadows, and other visual effects. These features can add polish to the interface, but reducing some effects may help on older computers or systems with limited hardware resources.

How to adjust visual effects:

1. Press Windows + R.
2. Type sysdm.cpl and press Enter.
3. Open the Advanced tab.
4. Under Performance, click Settings.
5. Select Adjust for best performance, or customize the effects individually.
6. Click Apply, then OK.

The best-performance option disables several visual effects, which may make Windows look less polished. If you prefer the normal Windows appearance, disable only resource-intensive effects or turn off animation and transparency effects in Settings.

This adjustment is most useful on older or lower-powered PCs. It is unlikely to produce a dramatic improvement on a modern computer that already has sufficient resources.

9. Change Power Mode Settings

Some Windows 11 computers use a power mode designed to conserve battery life. Depending on the device, this can limit performance during demanding tasks.

If your laptop feels sluggish when running applications, check its power settings.

How to change the power mode:

1. Connect your laptop to power if appropriate.
2. Open Settings.
3. Select System, then Power & battery.
4. Find Power mode.
5. Choose Best performance if it is available and suitable for your workload.

Power-mode options vary by device and manufacturer.

If you want to manage your computer’s power options more effectively, learn how to enable Hibernate on Windows 11 and understand when this feature is useful.

Note: Best performance may increase power consumption, fan noise, and heat. For everyday browsing and office work, Balanced may offer a better combination of performance and battery life.

10. Update Device Drivers

A problematic or outdated driver can cause hardware-related performance issues, graphics glitches, freezing, or compatibility problems.

If the slowdown began after installing new hardware, updating a driver, or installing a Windows update, investigate the affected component first.

How to check drivers:

1. Right-click Start.
2. Open Device Manager.
3. Expand the relevant category, such as Display adapters or Network adapters.
4. Right-click the device.
5. Select Update driver.
6. Follow the instructions.

Windows may not always find the newest driver. For important hardware, check the official support website of your PC manufacturer or component manufacturer.

Avoid third-party driver-updater utilities that make exaggerated claims or install drivers from unverified sources. If a problem started after a driver update, the Roll Back Driver option may be available.

11. Check and Repair Windows System Files

Corrupted system files can contribute to crashes, errors, and unusual Windows behavior. The built-in System File Checker and Deployment Image Servicing and Management tools can help repair certain Windows installation problems.

Use these tools if simpler fixes have not resolved the slowdown, particularly when Windows features are malfunctioning.

Steps to run system file repair:

1. Open Start.
2. Search for Command Prompt.
3. Select Run as administrator.
4. Run the following command:

DISM.exe /Online /Cleanup-Image /RestoreHealth

5. Wait for it to finish.
6. Run this command:

sfc /scannow

7. Wait until the scan completes, then follow any reported repair instructions.
8. Restart your PC and check performance again.

The DISM command can require an internet connection or access to a suitable repair source. Do not interrupt a scan simply because it appears to pause temporarily.

These commands are intended to repair Windows components and protected system files. They are not guaranteed to fix hardware limitations or every cause of slow performance.

If Windows continues to freeze or behave unexpectedly, follow Microsoft’s instructions for using System File Checker to scan for and repair corrupted Windows system files.

12. Check for Overheating and Hardware Limitations

If Windows 11 becomes slow during gaming, video editing, or other demanding work, your computer may be overheating or running out of hardware resources.

Heat can cause a processor to reduce its operating speed to protect itself. Insufficient RAM, a struggling storage drive, or an older processor can also limit performance.

Check the following:

• Make sure the laptop’s air vents are not blocked.
• Use the computer on a hard, flat surface when appropriate.
• Clean dust from vents carefully, following the manufacturer’s instructions.
• Check Task Manager for consistently high memory or disk usage.
• Look for recurring thermal warnings or unusual fan behavior.
• Check the storage drive’s health using a reputable diagnostic tool from its manufacturer.

If the PC has a traditional HDD, moving to a compatible SSD can significantly improve boot times and application responsiveness in many cases.

Additional RAM may help if memory is consistently full, provided your computer supports a compatible upgrade.

Back up important files before troubleshooting a drive that may be failing. Persistent clicking noises from an HDD, storage errors, or repeated file corruption warrant prompt attention.

How to Fix Windows 11 Running Slow After an Update

If your computer became slow immediately after a Windows update, do not assume that the update itself is permanently responsible. Windows may be completing background tasks, rebuilding indexes, or processing other changes.

Try these steps:

1. Restart your computer.
2. Keep it connected to power and the internet while pending updates finish, if appropriate.
3. Check Task Manager for processes consuming unusually high resources.
4. Install any available follow-up updates.
5. Check for relevant driver updates from the device manufacturer.
6. If the problem continues, review Windows Update history and investigate the specific update or driver associated with the slowdown.

If a recent update is clearly responsible and the issue persists, Windows provides recovery options in some circumstances. Before uninstalling an update or rolling back a driver, back up important files and understand the security or compatibility implications.

Avoid repeatedly interrupting updates or disabling Windows Update services as a general performance fix.

For additional troubleshooting advice, follow Microsoft’s guide to improving PC performance in Windows, which covers startup apps, storage cleanup, Windows updates, and other performance improvements.

How to Fix a Slow Windows 11 Startup

If Windows takes a long time to become usable after you switch on your PC, focus on startup applications, storage, and boot-related issues.

Try the following:

• Disable unnecessary startup apps in Task Manager.
• Uninstall applications you no longer use.
• Ensure the system drive has sufficient free space.
• Install appropriate Windows and driver updates.
• Investigate unusually high disk usage during startup.
• Check the health of your storage drive if boot times have worsened significantly.

If the computer starts quickly but becomes slow after you sign in, background applications or resource-intensive services may be responsible.

What If Windows 11 Is Still Running Slow?

If none of the methods above helps, narrow down the cause before making major changes.

Start Windows with a Clean Boot

A clean boot starts Windows with a limited set of startup programs and services. It can help identify whether a third-party application or service is causing the slowdown.

Use Microsoft’s clean-boot instructions carefully. Some applications and services may not function normally during the test, so record the original settings and restore them after troubleshooting.

Consider a Hardware Upgrade

If CPU or memory usage remains high during ordinary tasks, your hardware may no longer meet your needs.

Possible upgrades include:

• Adding RAM if your PC supports it.
• Replacing an HDD with a compatible SSD.
• Improving cooling if the system is overheating.
• Replacing an aging PC when its processor, memory, or other components cannot reasonably support your workload.

An upgrade should address an identified limitation rather than being based only on the age of the computer.

Reset Windows 11 as a Last Resort

If persistent software problems remain after other troubleshooting, consider using Windows recovery options to reset the PC.

Back up your files first. Read the reset options carefully, because the result depends on the option selected, and applications or settings may be removed. A reset is not the first choice for a computer that is merely slow.

Frequently Asked Questions

Final Verdict

A Windows 11 PC running slowly does not automatically mean you need to replace it. In many cases, disabling unnecessary startup apps, freeing up storage, checking system resources, updating drivers, and repairing Windows system files can improve performance.

Start with the simplest fixes and use Task Manager to identify the real cause. If your computer remains slow despite software troubleshooting, check for overheating, insufficient RAM, or a storage drive that may need replacement.

For more ways to improve your PC, read our guide to Windows 11 performance optimization tips and apply the settings that match your hardware and daily workload.