How to Fix High CPU Usage by .NET Runtime Optimization Service

Read along to know how you can resolve .NET Runtime Optimization Service high CPU usage, as here we have all that you would need.

This can make your system pretty slow, especially right after a Windows update or when the system is idle. One such service is known as the .NET Runtime Optimization Service, which is called mscorsvw.exe. This service basically helps to give good runtime in applications by preparing .NET assemblies. This high usage of CPU is because of the fact that the service makes use of every available CPU power so that these tasks could be completed as quickly as possible.

Resource-intensive background tasks running and/or corruption of the registry following a Windows update are common causes for this problem. Sometimes malware disguising as the service can also be a reason for such high CPU consumption.

Now that you know what causes this problem, let's move on to some solutions.

1. Manual Process Optimization

It is quite possible to do some manual optimizations of the.NET Runtime Optimization Service to help enhance the efficiency and reduce the high CPU usage that it has been causing. In so doing, you prioritize your system's pending tasks, hence fastening the activities that would have dragged on, hence improving performance as operations get completed without hang-ups.

Search through using the Search button, right-click on the first result that appears, and run as administrator. 

Hit Enter after each of the following commands which you will copy and paste. If your system is 32-bit, use the first command; if it's 64-bit, use the second. Move current directory to Microsoft.NET Framework version 4.0.30319 folder. run ngen.exe execute queue emit ems from the C:WindowsMicrosoft.NETFramework64v4.0.30319 directory

Verify that the CPU usage of the .NET Runtime Optimization Service is normal again.

2. Run a Malware Scan on Your Computer

The frequent causes of such problems may be malware infection. As malicious software can reduce the speed and compromise data security by stealing system resources, impersonating the genuine files of an operating system, running a malware scan becomes very important. Keep your operating system and applications up to date for added security. Run antivirus software that updates regularly to scan and eliminate threats.

Here is the official download link for Malwarebytes Anti-Malware. 

Double-click the installer in your Downloads folder and follow the prompts to begin installation. How to Configure Malwarebytes 

Open Malwarebytes, click on Scan, and let it complete its scan and update install process. Scanning simultaneously using Malwarebytes 

Enable the .NET Runtime Optimization Service and restart your computer after the scan.

3. Restart Service

For issues that occur, like stuck processes where the .NET Runtime Optimization Service eats up too much CPU, a restart would reset the service. For issues like that, restarting corrects them so the service would work even more properly. It will start afresh and will complete the tasks on time if you do so.

Press Windows Key + R to open the utility Run. Now enter services.msc and press OK. While Running Manage Services

Locate the 32-bit or 64-bit version of Microsoft.NET Framework NGEN v4.0.30319_X86, right-click onto it and click on Properties.

Stop the service from running now by clicking the Start button; then re-start it.Starting the application

If prompted select OK to confirm any dialog boxes. Select Startup type to be set as Automatic.

When attempting to start the service the following error message might display:

Windows cannot start the service on local computer. It is mostly because this service account of  is different from the currently running active services in the same process that gives rise to Error 1079.

If you are experiencing this issue, here are the procedures to repair it:

Log On tab can be accessed from the Service profile. Click on Browse. Join the Network>>Browse

Account name: enter Select an object type by typing in its name, then click Check Names to make sure that is correct then click OK.

Restart the Service: When prompted enter password.

4. Clean Boot

If you feel that your CPU utilization goes very high, try Clean Boot. It will start Windows with a minimum of drivers and launch programs and will eliminate software conflicts that occur when several apps and services load at the time of booting.

Then, check your CPU usage by following our clean boot guide. If the usage has come down, then it was an external application. You can identify the faulty application further by enabling applications one after the other.

That's the end of our How to Fix High CPU Usage by .NET Runtime Optimization Service guide; hope it has been of extreme use to you.