Windows 11 slowness usually comes from too many programs running at startup, a full hard drive, outdated drivers, or malware—and you can check each one yourself in about an hour

A slow Windows 11 computer is almost never a mystery. The operating system logs what is consuming your resources, and you can see it without special tools. Start by opening Task Manager (right-click the taskbar and select it, or press Ctrl+Shift+Esc), then click the Performance tab. Look at CPU, Memory, Disk, and GPU percentages. If one is consistently above 80 percent when you are not actively using it, that is your culprit.

The most common causes are startup programs you forgot about, a nearly full hard drive, missing Windows updates, or browser extensions running in the background. Less often, it is malware or a failing hard drive. This guide walks you through checking each one and fixing what you find.

Key Takeaways

  • Open Task Manager to see which programs are using the most CPU, memory, disk, or GPU right now—this tells you what to fix first.
  • Disable startup programs you do not use by opening Task Manager, clicking the Startup tab, right-clicking each program, and selecting Disable.
  • Check your hard drive space by right-clicking C: drive in File Explorer, selecting Properties, and deleting or moving files if you have less than 10 percent free.
  • Run Windows Update (Settings > Update & Security > Check for updates) and restart, because missing updates often slow performance.
  • Scan for malware using Windows Defender (Settings > Privacy & security > Virus & threat protection > Scan options > Full scan) if slowness started suddenly.

Check what is actually running right now

Task Manager shows you every program consuming CPU, memory, disk, or GPU at this moment. Open it by right-clicking your taskbar and selecting Task Manager, or press Ctrl+Shift+Esc. Click the Performance tab at the top.

You will see four main resources: CPU, Memory, Disk, and GPU. Watch these percentages while you are not doing anything—just sitting at the desktop. If any one stays above 80 percent, click that resource name (for example, "Disk") to sort by it. The program at the top is the one slowing you down. Write down its name. If it is something you recognize and do not need, you can uninstall it or disable it from starting automatically (see the next section). If it is something you do not recognize, search the name online—it might be a Windows system file, a driver, or malware.

Disable programs that start automatically

Many programs add themselves to startup so they launch when you turn on your computer. Each one uses a little memory and CPU, and dozens of them add up. Open Task Manager again and click the Startup tab. You will see a list of programs with a Status column showing Enabled or Disabled.

Right-click any program you do not need to start automatically—for example, Spotify, Discord, or a printer utility—and select Disable. Do not disable anything labeled Windows, Nvidia, or AMD unless you are certain what it does. Restart your computer for the change to take effect. Each program you disable saves a small amount of memory and speeds up startup time.

Free up hard drive space

Windows 11 slows down noticeably when your hard drive is more than 90 percent full. Open File Explorer, right-click your C: drive (or whichever drive Windows is installed on), and select Properties. Look at the pie chart. If the blue section (used space) takes up most of the circle, you need to delete or move files.

Start by emptying your Recycle Bin (right-click it on the desktop and select Empty Recycle Bin). Then delete old Downloads—open File Explorer, click Downloads, sort by date, and delete files you no longer need. If you still need more space, use Disk Cleanup: press Windows key + R, type cleanmgr, and press Enter. Select your C: drive and click OK. Check the boxes for Temporary files, Recycle Bin, and Temporary internet files, then click Delete Files. Aim to have at least 10 percent of your drive free—on a 500 GB drive, that is 50 GB.

Install Windows updates and restart

Microsoft releases updates that fix performance problems, security holes, and driver issues. Open Settings (press Windows key + I), click Update & Security on the left, then click Check for updates. Windows will read and install any available updates. You will need to restart your computer—do this as soon as you can, even if it says you can restart later.

After restart, check for updates again. Sometimes there are multiple rounds of updates, and the second round only appears after the first restart. This is normal. Keeping Windows current is one of the easiest ways to maintain speed.

Update your drivers

Drivers are the software that lets Windows talk to your hardware—your graphics card, network adapter, chipset, and so on. Outdated drivers can cause slowness, stuttering, or crashes. The easiest way to update them is through Windows Update (which you just did), but you can also update them manually.

Right-click the Start button and select Device Manager. Look for any devices with a yellow warning triangle—those need attention. For graphics, look for Display adapters; for network, look for Network adapters. Right-click the device and select Update driver. Choose Search automatically for updated driver software. Windows will search online and install the latest version if one is available. Restart when prompted.

If you have an Nvidia or AMD graphics card, you can also visit their websites directly to read the latest driver. This is optional but sometimes gives you newer versions than Windows Update.

Scan for malware

Malware and unwanted programs can run in the background and consume resources. If your computer suddenly became slow, or if you notice strange behavior, run a malware scan. Open Settings (Windows key + I), click Privacy & security on the left, then click Virus & threat protection. Under Virus & threat protection settings, click Manage settings, then scroll down and make sure Real-time protection is On.

Now go back to Virus & threat protection and click Scan options. Select Full scan and click Scan now. This will take 15 to 60 minutes depending on how much data you have. Let it finish. If it finds anything, Windows will quarantine it automatically. After the scan completes, restart your computer.

If you suspect a serious infection, or if the scan does not improve speed, consider running a second opinion scan with Malwarebytes (a free version is available online). Do not read security software from ads or pop-ups—only from official websites.

Check your hard drive health

Hard drives fail gradually. As they age, they slow down and eventually stop working. If your computer is several years old and slowness is getting worse over time, your hard drive might be failing. You can check its health using a free tool called CrystalDiskInfo. read it from the official website, install it, and run it. It will show you your drive's temperature and health status. If the status is Caution or Bad, your drive is failing and you should back up your files when ready and plan to replace it.

If you have a solid-state drive (SSD) instead of a traditional hard drive, it is less likely to fail suddenly, but it can still slow down if it is full or if the firmware is outdated. The same information applies: keep at least 10 percent free, and check for firmware updates on the manufacturer's website.

Frequently Asked Questions

Why is my computer slow only when I open Chrome or Edge?

Your browser is probably running too many extensions or tabs. Open your browser, press Ctrl+Shift+Esc to open its task manager, and look at which tabs or extensions are using the most memory. Close tabs you do not need, and disable extensions you do not use (right-click the extension icon and select Manage extensions). Each extension runs code in the background, even when you are not using it.

My computer is slow but Task Manager shows nothing using much CPU or memory. What is wrong?

The problem might be disk speed rather than disk space. Click the Disk column in Task Manager to sort by it. If a program shows high disk activity, it is reading or writing files slowly—this can happen if your hard drive is failing or if you have too many browser tabs open. Also check your internet speed: open a speed test website. If your read speed is much slower than your plan promises, contact your internet provider.

Should I use a cleaning tool or optimizer software to speed up Windows?

Most cleaning and optimizer tools do not help and some make things worse. Windows handles its own temporary files and registry cleanup reasonably well. The steps in this guide—disabling startup programs, freeing disk space, updating Windows, and scanning for malware—are more effective and safer than third-party tools. If you want to clean temporary files, use the built-in Disk Cleanup tool (cleanmgr) instead.

How much RAM do I need for Windows 11 to run fast?

Windows 11 runs on 4 GB of RAM, but 8 GB is more comfortable for everyday use. If you regularly have many browser tabs open or run heavy programs, 16 GB is better. You can check how much you have by opening Task Manager, clicking the Performance tab, and looking at Memory. If it consistently shows 90 percent or higher, adding more RAM would help—but first try the steps above, because they usually solve slowness without hardware upgrades.

Is it normal for Windows 11 to be slower than Windows 10?

Windows 11 uses slightly more resources than Windows 10, but the difference is small. If your computer was fast on Windows 10 and slow on Windows 11, the issue is usually not Windows itself but something that changed during the upgrade—a driver that did not install correctly, a startup program that was re-enabled, or a setting that changed. Run through the steps in this guide, and if slowness persists, check your driver versions and Windows Update status again.