The NET Runtime Optimization Service is a process that helps precompile .NET assemblies in the background. This is an operation that improves the performance of .NET applications on your computer. Normally, this process completes quickly and does not affect your system resources. However, sometimes it consumes a lot of CPU and slows down your PC. In this article, we will tell you the possible causes of this problem and how to fix it easily.

The causes of the problem

There are several reasons why the NET Runtime Optimization Service may use a lot of CPU on your computer. Here are the most common:

• The process runs slowly and takes longer than expected to precompile .NET assemblies.
• Your computer is infected with malware that interferes with the process or hijacks it for malicious purposes.
• The service is damaged or corrupted and is not working properly.
• You have installed or updated applications that use the .NET Framework and require assemblies to be reprecompiled.

Possible solutions

Fortunately, there are several solutions you can try to resolve the issue of high CPU usage by the NET Runtime Optimization Service. We will present to you the most effective and simplest to implement.

Solution 1: Speed ​​up the process

The first thing you can do is try to speed up the .NET assemblies precompilation process by giving it more CPU resources . To do this, you need to run a command in Command Prompt as administrator. Here are the steps to follow:

• Press Windows + R Run dialog box .

• Type cmd and press Ctrl + Shift + Enter to open Command Prompt as administrator.
• Copy and paste the following commands into Command Prompt and press Enter after each one:

cd C:\ Windows \Microsoft.NET\Framework\v4.0.30319 ngen.exe executequeueditems cd C:\ Windows \Microsoft.NET\Framework64\v4.0.30319 ngen.exe executequeueditems

• These commands will force the NET Runtime Optimization Service to complete its task more quickly using all available cores of your processor.
• Wait for the process to complete and check if the problem is resolved.

Solution 2: Scan for malware

Another possible cause of the problem is the presence of malware on your computer that can affect the operation of the NET Runtime Optimization Service or use it for malicious purposes. To eliminate this possibility, you should perform a full scan of your system with reliable and up-to-date antivirus software . Windows 's built-in antivirus , Windows Defender , or another antivirus software of your choice. Here's how to do a scan with Windows Defender:

• Press Windows + I to open Windows Windows Settings .

• Click Update & Security , then Windows Security in the left menu.
• Click Virus & Threat Protection , then Scan Options .

• Select Full Scan and click Scan Now .
• Wait for the scan to complete and follow the on-screen instructions to remove any detected threats.

• Restart your computer and check if the problem is resolved.

Solution 3: Restart services

Another possible solution is to restart the services related to the NET Runtime Optimization Service. These services may be blocked or not working properly. To restart them, you need to use Windows Services Manager. Here's how to do it:

• Press Windows + R Run dialog box .
• Type services.msc and click OK to open Services Manager.

• Look for the following services in the list:
  • Microsoft .NET Framework NGEN v4.0.30319_X86
  • Microsoft .NET Framework NGEN v4.0.30319_X64
  • Microsoft .NET Framework NGEN v2.0.50727_X86
  • Microsoft .NET Framework NGEN v2.0.50727_X64
• Right-click each service and select Restart .
• Wait for the services to restart and check if the problem is resolved.

Solution 4: Disable the service

If none of the previous solutions work, you can try disabling the NET Runtime Optimization Service . This solution is not recommended because it may affect the performance of .NET applications on your computer. However, if you don't use these apps often or are willing to sacrifice a little speed to reduce CPU usage, you can try this solution. Here's how to do it:

• Press Windows + R Run dialog box .
• Type services.msc and click OK to open Services Manager.
• Find the Microsoft .NET Framework NGEN v4.0.30319_X86 in the list.

• Right-click the service and select Properties .
• On the General , change the Startup type to Disabled and click OK .
• Repeat the same steps for other services related to the NET Runtime Optimization Service (see solution 3).
• Restart your computer and check if the problem is resolved.

FAQs

Here are some frequently asked questions from users regarding the NET Runtime Optimization Service.

Conclusion

The NET Runtime Optimization Service is a useful process that helps improve the performance of .NET applications on your computer. CPU usage issues and slow down your PC. In this article, we have presented you with four possible solutions to fix this problem easily. We hope this article was helpful and you were able to resolve the NET Runtime Optimization Service high CPU usage issue.