Troubleshoot and fix a Dell computer that is running slow

概要: Experiencing slow performance on your personal computer? Find effective troubleshooting steps to resolve lagging issues and enhance your Dell personal computer's speed and efficiency.

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現象

Your Dell computer may be experiencing a performance issue if you notice one or more of the following symptoms:

  • Computer running slow and takes a long time to boot into the operating system or stops responding.
  • Applications take a long time to load or respond.
  • The computer responds slowly or stops responding during user activity such as clicking and typing.
  • My computer is running slow and takes a long time to respond or stops responding during shutdown or restart.
  • Browsers and other applications stop responding or stops responding frequently.

Try these quick steps to resolve system performance issues on a Dell computer .

Optimize your System using SupportAssist.

Duration: 00:32
Closed captions: This video is available in multiple languages. Click the Closed Caption icon and select the language that you want.

原因

Performance issues in computers can be caused due to:

  • Fragmented data on the hard disk drive.
  • Unused applications running in the background.
  • Outdated drivers for devices such as chipset, BIOS, docking stations, and so on.
  • Outdated or corrupt operating system files.
  • Current computer configuration does not meet the requirements for high-end applications or games.
  • Hard disk errors.
  • Insufficient system memory (RAM).
  • Hardware failure.
  • Malware infection.

解決方法

Follow the steps mentioned below to help resolve slow performance issues on your Dell computer. Also, find more information in the optional steps and informational videos section of this article.

NOTE: Dell Technologies recommends disconnecting devices such as printers, docking stations, and so on, before proceeding with the troubleshooting steps. This can help determine if the issue is with the computer or the device.

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The SupportAssist application optimizes your computer (including updating outdated drivers) to help resolve performance issues.

  1. Press and hold the Windows key (Windows Button), and then press the q key.
  2. In the search box, type SupportAssist.
  3. Select SupportAssist (App) in the list of results.
    NOTE: When SupportAssist does not show up in the search results, go to the SupportAssist for PCs and tablets page for information about downloading and installing SupportAssist.
  4. Touch or click Start Now to run the tests.
    NOTE: You can touch or click the down arrow and then run the individual test. Dell Technologies recommends running a full computer test.
  5. SupportAssist runs the tests one by one and provides the results and suggested actions.

Restart your computer if you have not done so lately.

A reboot or restart can resolve many issues. Restarting your computer is an effective way to clear the computer memory (RAM) and shut down any errant processes and services.

Restarting your computer closes all the applications and services running on your computer, including background processes that other programs have started. The more programs that you have open and the longer they run, the more likely your computer slows down and eventually run out of RAM. Ideally, you should shut down your computer when it is not in use. If you use your computer frequently, Dell Technologies recommends restarting the computer at least once per week.

If restarting the computer does not resolve the issue, go to the next step.

Running a hardware diagnostic test can help you identify hardware-related problems and provide you with troubleshooting steps to help resolve the issue. To determine if your Dell computer is experiencing a hardware problem, it is recommended that you first run a hardware diagnostic test. Dell offers both integrated and online diagnostics.

Running a hardware diagnostic tests using Dell SupportAssist

If the computer can boot into Windows and has an active Internet connection, run a quick test on the Dell computer using Dell SupportAssist.

Running Dell SupportAssist Preboot System Assessment or enhanced Preboot System Assessment (Dell PSA or ePSA)
  1. Restart the computer.
  2. When the Dell logo appears, press the F12 key to enter the One-time Boot Menu.
  3. Use the arrow keys to select Diagnostics and press the Enter key.
  4. Follow the on-screen prompts and respond appropriately to complete the diagnostics.
    1. If the test passes, go to the next step.
    2. If the test fails, ensure to write down the error code and validation code, and contact Dell Technical Support.

Diagnose Hardware Issues on Your Dell Notebook or Desktop using Dell ePSA Diagnostic Test.

Duration: 01:34
Closed captions: This video is available in multiple languages. Click the Closed Caption icon and select the language that you want.

Malware (viruses, spyware, trojans, and so on) can cause the computer to stop working or perform slowly. Malware can monitor users web browsing, display unsolicited advertisements and click baits. Malware can be used against users to gain access to personal data such as identification numbers or details, bank or credit card numbers, passwords, datafile, and so on.

If you suspect that your computer has been infected, Dell Technologies recommends that you run a thorough or deep scan on your computer using an anti-virus or anti-malware program. Windows 10 computers come equipped with Windows Defender, which provides basic protection against malware, but dedicated anti-virus or anti-malware software can thoroughly scan your computer and remove malicious programs. Most Dell computers are preinstalled with a basic anti-virus software such as McAfee that requires a subscription from the software manufacturer. There are many other anti-virus or anti-malware programs (free-to-use and subscription-based) that you may use.

NOTE: Installing more than one anti-virus or anti-malware program on your computer does not give you better protection. Instead, it may slow down your computer further. Dell Technologies recommends installing one anti-virus or anti-malware program and updating it regularly to maintain active protection against malware.

Learn how to Protect Your Computer or Remove Malware in Microsoft Windows.

If you do not find any malware on the computer, go to the next step.

How to Remove Viruses in Windows 11

Duration: 03:48
Closed captions: This video is available in multiple languages. Click the Closed Caption icon and select the language that you want.

System Restore is a Microsoft Windows operating system feature that can help fix certain types of crashes and other computer problems. System Restore reverts your computer's state (including computer files, installed applications, Windows Registry, and computer settings) to a previous point in time. You can create "restore points" manually at any time, but Windows automatically creates them whenever:

  • An application or software is installed.
  • Windows Update installs updates.
  • A device driver is installed.
NOTE: System Restore does not save old copies of any personal files or data, so it does not delete or replace them during a restoration. System restore is also not an effective way to remove any type of malware on your computer.
 
NOTE: You must be logged in as a user with administrator rights on your computer to run System Restore.

Learn How to Use System Restore in Microsoft Windows.

If restoring the computer to a previous date does not resolve the issue, go to the next step.

If your Dell computer continues to lock up, stop responding, or run slowly, and the troubleshooting steps above did not resolve the issue, consider reinstalling the operating system. If you do not want to reinstall the operating system, see the Optional Steps section to see other potential solutions.

WARNING: Reinstalling the operating system results in the permanent loss of all data on the computer. Dell Technologies recommends that you back up all personal data to an external storage device, including but not limited to images, documents, email messages, contacts, browser bookmarks (favorites), music, videos, and so on.

Learn how to Restore your Computer Using SupportAssist OS Recovery.

その他の情報

Check and clean the air vents on your Dell computer.

If your computer's air vents become clogged with lint and dust, use a can of compressed air to clean them off and restore airflow. Inadequate airflow can cause your computer's processor, memory (RAM), and other internal hardware to overheat and potentially fail. Excessive heat can also decrease performance, as most processors automatically reduce their speed to prevent overheating. If you notice the computer fan running constantly, this might indicate that your computer's air vents are clogged.

CAUTION: Turn off your computer and disconnect the power cable or AC adapter before using compressed air to clean your computer. Follow the instructions on the side of the compressed air can, as using compressed air incorrectly can damage your computer.
CAUTION: Do not try to blow the dust using your mouth. Moisture causes irreparable damage to electronic or electrical components.
CAUTION: Do not use vacuum cleaners or blowers. Vacuum cleaners and blowers cause static and may damage electronic or electrical components inside your computer.

How to clean air vents

Duration: 00:40
Closed captions: This video is available in multiple languages. Click the Closed Caption icon and select the language that you want.

  1. Turn off the computer.
  2. Check the air vents on the computer for dust or debris.
    Vents may be located in various places depending on the computer model. See the User Manual of your Dell computer.
  3. Use a can of compressed air to remove dust or debris from the air vents.
NOTE: To prevent overheating, keep the computer in an upright position and on a hard or sturdy surface, and provide adequate clearance around the air vents.

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Upgrade the computer memory (RAM).

Generally, most computers are capable of memory (RAM) upgrades. Before you consider upgrading the memory (RAM) on your Dell computer, we recommend that you verify how much memory (RAM) is installed on your Dell computer and the maximum amount of memory (RAM) that your Dell computer can support. To learn more about the computer configuration and memory specifications of your Dell computer, see the User Manual on the Dell Support website.

NOTE: Some Dell Ultrabook laptops have integrated memory (RAM) and hence cannot be replaced or upgraded.
 
NOTE: Before purchasing memory (RAM) modules, verify the type of memory that can be used with your Dell computer, the maximum amount of memory (RAM) and the number of memory modules that your Dell computer can support.

To purchase upgrade components for your Dell computer, go to the Dell website.

To learn more, see the Dell knowledge base article How to Upgrade Memory in Your Computer.

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Upgrade hard disk drive to solid state drive (SSD).

Conventional hard disk drives have moving components and hence have lower read or write speeds compared to solid state drives (SSD). A solid state drive uses flash memory and can read or write data faster and uses less power, in turn, extends laptop battery life. Upgrading to a solid state drive can provide significant improvement in performance.

Things to consider before upgrading the hard disk drive on your Dell computer:

  • Form factor - Hard disk drives come in two form factors: 3.5-inch drive - used on desktop computers and 2.5-inch drive - used on laptops.
  • Connector - What type of connector is available on your computer? IDE or S-ATA (Serial ATA) connector (SATA-I, SATA-II, or SATA-III connector).
  • Capacity - What is the maximum hard disk drive capacity that your computer can support?
NOTE: Before purchasing a solid state drive (SSD), verify that your Dell computer can support an SSD hard disk drive.

To purchase upgrade components for your Dell computer, go to the Dell website.

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Check to see if one or more of the same issues occur in Safe Mode

Safe mode prevents noncrucial applications and device drivers from loading, which helps eliminate software as a cause of slow performance.

NOTE: Display resolution in Safe Mode is automatically set to 800 x 600 and the icons and text appear larger than normal. The desktop background wallpaper is disabled in Safe Mode. This is normal behavior and does not require troubleshooting. All the visual settings return to normal when the computer is rebooted into regular mode.
 
WARNING: When you log in to Safe Mode (in this case, Safe Mode with Networking), your anti-virus or anti-malware program is disabled. Use caution when connected to a network or the Internet while your anti-virus is disabled.

To learn how to boot your computer into Safe Mode, see the links below based on the operating system that is installed on your computer.

If the issue does not exist in Safe Mode, the issue is likely related to a device driver or software. Ensure to update the device drivers and install any software updates that may be available for your computer including Microsoft Windows Updates.

However, if the issue still exists in Safe Mode, go to the next step.

Clean Boot with MSConfig

Duration: 0:55
Closed captions: This video is available in multiple languages. Click the Closed Caption icon and select the language that you want.

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Limit startup programs

Many applications or software that are run in the computer tray, or also called notification area. These applications usually launch during startup and stay running in the background but remain hidden. Preventing these applications from launching during startup speeds up the login process, also save a lot of memory (RAM) and processing power to improve the performance of your computer.

WARNING: It is recommended that you do not disable the anti-virus or anti-malware program or application from loading during startup. Disabling the anti-virus or anti-malware program may make your computer vulnerable to malware infection.
NOTE: You must be logged in as a user with administrator rights on your computer to disable startup programs.
How to disable startup programs in Microsoft Windows 11

Here are three options:

  • Disable Startup Programs using the Settings application
    1. In the Windows search box, type Settings.
    2. Select Settings from the list.
    3. On the left side of Settings, selectApps and then select Startup.
    4. Select to turn On or Off the programs you want to startup when the computer is turned on.

 

  • Disable All Startup Programs using the MSConfig app
    1. Press and hold the Windows key (Windows Button), and then press the r key.
    2. In the Run box, type msconfig, and click OK.
    3. In the System Configuration Window, select Selective startup, ann then select to clear Load startup items.
    4. Click Apply, and then OK.
    5. Close the System Configuration Window.

 

  • Disable Startup Programs using the Task Manager app
    1. Press and hold the Ctrl key, and then press and hold the Alt key, and then press the Delete key.
    2. Select Task Manager.
    3. In the Task Manager, select Startup apps.
    4. Select each application one at a time and select Enable or Disable.
    5. Close the Task Manager window.
How to disable startup programs in Microsoft Windows 10
  1. Close all open windows.
  2. Press and hold the Ctrl key, and then press and hold the Shift key, and then press the ESC key.
  3. In the Task Manager window, click the Startup tab.
  4. Select the program or application that you want to disable from loading during startup.
  5. Right-click and select Disable.
  6. Repeat Step 4 & 5 for all the programs or applications that you want to disable from loading during startup.
  7. Restart your computer.

If disabling startup programs does not resolve the issue, it is most likely that your operating system is corrupt and you must reinstall the operating system. See the Restore the computer to factory defaults section in the Troubleshooting Steps.

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Informational videos

Troubleshooting Slow Internet and Network Connections

Duration: 01:51
Closed captions: This video is available in multiple languages. Click the Closed Caption icon and select the language that you want.

How to Perform System Restore in Windows 10

Duration: 01:22
Closed captions: This video is available in multiple languages. Click the Closed Caption icon and select the language that you want.

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Out of Warranty support Out of warranty? No problem. Browse to the Dell.com/support website and enter your Dell Service Tag and view our offers.

NOTE: Offers are only available for US, Canada, UK, France, Germany, China, and Japan personal computer customers. Server and Storage not applicable.

対象製品

Alienware, Dell All-in-One, Dell Pro All-in-One, Dell Pro Max Micro, Dell Pro Max Slim, Dell Pro Max Tower, Dell Pro Micro, Dell Pro Slim, Dell Pro Tower, Dell Slim, Dell Tower, Inspiron, Legacy Desktop Models, OptiPlex, Vostro, XPS, G Series , G Series, Alienware, Dell Laptops, Dell Plus, Dell Pro, Dell Pro Max, Dell Pro Plus, Dell Pro Premium, Inspiron, Latitude, Dell Pro Rugged, Vostro, XPS, Legacy Laptop Models, Fixed Workstations, Mobile Workstations, Dell Pro Max Micro XE FCM2250, Dell Pro Max Slim XE FCS1250, Dell Pro Max Tower T2 XE FCT2250, Dell Pro Max 16 XE MC16250, Dell Pro Micro Plus XE QBM1250, Dell Pro Slim Plus XE5 QBS1250 ...
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文書番号: 000178928
文書の種類: Solution
最終更新: 19 6月 2025
バージョン:  37
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