Does Microsoft Defender Antivirus slow down our computer?

30 May 1402 at 15:17

Windows Defender Antivirus – Microsoft’s Windows Defender has been accused of slowing down the system and reducing computer battery life. Is this claim true?

Microsoft Defender is a Windows antivirus software that is installed by default on Windows computers. This free program can effectively protect your computer from malware and other security threats. However, Microsoft Defender has been criticized by some for the impact it has on computer performance.

According to a new study conducted by AV-Test, Microsoft Defender uses an average of 10% more CPU resources than other antiviruses. This can lead to a significant slowdown in computer performance, especially on older and underpowered models.

Microsoft Defender antivirus, the cause of slowing down the computer?

Microsoft Defender Antivirus

Apparently, Microsoft Defender also has a negative impact on battery life performance. This study shows that Windows’ default antivirus reduces computer battery life by an average of 15%. This can be a big challenge for users who rely on their laptop for work or study.

Microsoft Defender’s negative impact on battery performance is due to the way this antivirus scans files. Defender actually scans all files that are open or running on your computer. This process is time-consuming, especially for large folders. The scanning process can also be another factor in occupying CPU resources and reducing battery life.

But there are ways to reduce the negative impact of Microsoft Defender performance. One of these methods is to disable the “Real-time Scanning” feature. This feature scans all files at runtime, although disabling it can reduce malware protection.

Another solution you can do to prevent the negative impact of this antivirus is to schedule a scan for a time when you are not using your computer. Scheduling scans allows Windows Defender to scan your computer without affecting work or play.

But the last resort is to use an alternative antivirus program. Some of these programs, which are available for free or for a fee, do not have the negative performance impact of the Microsoft program.

Is Microsoft Defender good at detecting viruses?

Despite the impact on computer performance, Microsoft Defender is a good and useful antivirus program that is effective in detecting and blocking malware and is free to use. However, if your device’s processing performance or battery is affected by this program, it is recommended to use another antivirus.

Advantages and disadvantages of Microsoft Defender Antivirus


  • It is effective in identifying and blocking malware
  • It is easy to use
  • It is well integrated with Windows


  • It may negatively affect the performance of the computer
  • Unlike some antivirus programs, it is not customizable

Introducing the best Windows security programs

The best antiviruses on the market are those that offer comprehensive and complete protection against a wide range of threats such as viruses, malware, ransomware and other malicious software. In addition, these programs should provide an easy user interface and have a minimal impact on system performance.

In a recent test by AV-Test, which is an independent security testing laboratory, a total of 14 Windows antivirus programs were evaluated. Meanwhile, the following 6 programs managed to get a maximum score of 18:

  1. he is
  2. Avira
  3. Bitdefender
  4. G-data
  5. Kaspersky
  6. Micro trend

All of the above programs provided excellent protection against various types of security threats. They are also easy to use and have little impact on system performance. But in addition to the top 6 programs that got the maximum score, 8 other antiviruses also got a very good score of 17.5. These programs include:

  1. AhnLab
  2. AVG
  3. F-Secure
  4. K7 Computing
  5. Malwarebytes
  6. McAfee
  7. Norton
  8. Protected.net

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