A slow computer is frustrating. Programs take forever to open, the screen freezes at the worst moments, and even simple tasks feel like a chore. The good news: you rarely need to buy a new PC. In most cases, Windows 11 just needs a proper cleanup and a few settings tweaks.
In this step-by-step guide, you will learn 12 proven ways to speed up Windows 11 and fix a slow PC. Each method includes exact instructions, so beginners can follow along safely. Let’s get started.
Before You Start: Find Out What’s Slowing Your PC
Before changing anything, check what is using your computer’s resources. Press Ctrl + Shift + Esc to open Task Manager, then look at the CPU, Memory, and Disk columns. If any of them sits above 80-90% while you are doing nothing, you have found your bottleneck.
Also, restart your computer first. It sounds too simple, but a fresh restart clears out days of accumulated background processes and temporary glitches. If the PC is still slow after a restart, work through the fixes below.
1. Install Pending Windows Updates
Microsoft regularly releases updates that patch bugs, close security holes, and improve performance. A PC that hasn’t been updated in months can run noticeably slower.
Go to Settings > Windows Update and click Check for updates. Install everything available, then restart your computer when asked.
2. Disable Unnecessary Startup Programs
Many apps launch automatically with Windows and sit in the background, eating memory from the first second. Disabling the ones you don’t need is one of the fastest ways to speed up boot times.
Open Task Manager (Ctrl + Shift + Esc), click Startup apps in the left sidebar, and look at the Status column. Right-click any program you don’t need immediately after booting — such as Spotify, Discord, or updater tools — and choose Disable. Don’t worry: this doesn’t uninstall anything; it only stops the app from launching on its own.
3. Turn Off Background Apps You Don’t Use
Even apps you rarely open may run in the background, syncing data and using CPU cycles. Go to Settings > Apps > Installed apps, click the three dots next to an app you barely use, choose Advanced options, and set Let this app run in background to Never.
Repeat this for apps like weather widgets, news feeds, and preinstalled software you never touch.
4. Free Up Disk Space with Storage Sense
Windows slows down when the system drive is nearly full — it needs free space for temporary files, updates, and virtual memory. As a rule of thumb, keep at least 15-20% of your main drive free.
Go to Settings > System > Storage and turn on Storage Sense. It automatically removes temporary files, empties the Recycle Bin on a schedule, and clears old Downloads. You can also click Cleanup recommendations to remove large or unused files manually.
5. Uninstall Programs You Never Use
Old games, trial software, and preinstalled apps you never opened still take up disk space and sometimes run background services. Go to Settings > Apps > Installed apps, sort by size, and uninstall anything you don’t recognize or haven’t used in months. Click the three dots next to a program and choose Uninstall.
Be careful not to remove drivers or hardware utilities from your PC manufacturer — if you’re unsure about an entry, search its name online first.
6. Turn Off Visual Effects and Animations
Windows 11’s animations and transparency look nice, but they cost processing power — especially on older or low-end PCs. Press the Windows key, type Adjust the appearance and performance of Windows, and open it. On the Visual Effects tab, select Adjust for best performance, then click OK.
You can also turn off transparency separately at Settings > Personalization > Colors > Transparency effects for an extra small boost.
7. Switch to the Best Performance Power Plan
Laptops often run in a balanced or power-saving mode that limits CPU speed to save battery. If your PC is plugged in, switch to maximum performance: go to Settings > System > Power & battery and set Power mode to Best performance.
On desktops, this setting matters less, but it still prevents Windows from throttling your processor during heavy tasks.
8. Update Your Drivers
Outdated graphics, storage, and chipset drivers can cause stuttering, freezes, and slow file transfers. Open Device Manager (right-click the Start button), expand categories like Display adapters and Disk drives, right-click a device, and choose Update driver > Search automatically for drivers.
For the best results, download graphics drivers directly from NVIDIA, AMD, or Intel — their automatic tools keep you on the latest stable version with performance fixes.
9. Run the Disk Cleanup Tool
The built-in Disk Cleanup tool removes gigabytes of junk in minutes. Press the Windows key, type Disk Cleanup, and select your system drive. Check items like Temporary files, Recycle Bin, Thumbnails, and Delivery Optimization Files, then click OK. Click Clean up system files afterward for a deeper pass that removes old Windows update leftovers.
10. Scan for Malware
Malware and unwanted software are a common hidden cause of sudden slowdowns. Open Windows Security from the Start menu, go to Virus & threat protection, and run a Full scan. It takes longer than a quick scan but checks every file on your drives.
Also review your browser extensions — a single badly behaved extension can make your whole system feel sluggish while browsing.
11. Increase Virtual Memory
If your PC has 8 GB of RAM or less, increasing virtual memory (the paging file Windows uses as overflow RAM) can reduce stuttering when many apps are open. Press the Windows key, type View advanced system settings, and open it. Under Performance, click Settings, go to the Advanced tab, and click Change under Virtual memory.
Uncheck Automatically manage paging file size, select your system drive, choose Custom size, and set the initial size to 1.5 times your RAM in megabytes and the maximum to 3 times. Click Set, then OK, and restart.
12. Reset Windows as a Last Resort
If nothing else helps, resetting Windows gives you a completely fresh start. Go to Settings > System > Recovery and click Reset PC. Choose Keep my files to reinstall Windows while preserving your personal files (you’ll still need to reinstall your apps).
Back up anything important first, just in case — an external drive or cloud backup takes a few minutes and saves a lot of regret.
How to Keep Windows 11 Fast Over Time
Speeding up your PC once is great, but a few simple habits keep it fast:
- Restart your computer at least once a week.
- Keep 15-20% of your system drive free at all times.
- Install Windows updates promptly instead of postponing them for months.
- Avoid “free PC cleaner” tools — most are unnecessary, and some are malware in disguise.
- If your PC still uses a traditional hard drive, upgrading to an SSD is the single biggest speed boost you can buy.
Frequently Asked Questions
Why is my Windows 11 suddenly so slow?
A sudden slowdown is often caused by a recent update installing in the background, a full system drive, a malware infection, or a program using 100% of your disk or CPU. Check Task Manager first, then work through the fixes above.
Will resetting Windows delete my files?
Not if you choose “Keep my files” during the reset. Your personal files stay, but installed apps and settings are removed. Back up important data first anyway.
Is 8 GB of RAM enough for Windows 11?
It’s enough for web browsing, office work, and light multitasking. If you edit video, run virtual machines, or keep dozens of browser tabs open, 16 GB makes a noticeable difference.
Do I need a third-party PC cleaner?
No. Windows already includes everything you need — Storage Sense, Disk Cleanup, Windows Security, and Task Manager. Third-party cleaners rarely help and sometimes cause problems.
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