Windows 10: Fix .NET Runtime Optimization Service High CPU usage on Windows 11/10

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If you see 100% or high CPU, GPU or Disk usage by the .NET Runtime Optimization Service (mscorsvw.exe) on your Windows 11/10 PC, then this guide will help you fix the problem. Why is .NET Runtime Optimization Service using a high CPU? The major reasons for the .NET Runtime Optimization Service to use a high […]

This article Fix .NET Runtime Optimization Service High CPU usage on Windows 11/10 first appeared on TheWindowsClub.com.

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.NET Runtime Optimization Service

This showed up on my Windows 10 after a mandatory update by Microsoft. Now a perfectly good computer is acting up as usual after updates.

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  Windows 10 Version 1703
  
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  KB4015583 (OS Build 15063.138)
  
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  KB4016251 (OS Build 15063.13)
  

.NET Runtime Optimization Service

Location: C:\Windows\Microsoft.NET\Framework\v4.0.30319

105 KB (107,704 bytes)

68.0 KB (69,632 bytes)

Created: ‎Saturday, ‎March ‎18, ‎2017, ‏‎5:00:01 PM

Modified: ‎Saturday, ‎March ‎18, ‎2017, ‏‎5:00:01 PM

Accessed: ‎Saturday, ‎March ‎18, ‎2017, ‏‎10:37:11 PM

 

Runtime Broker high CPU usage

I am running Windows 10 Pro (Version 1511 for x64, update KB3149135) and had problems with Runtime Broker.exe using anywhere from 30% to 90% of my CPU. Disabling hints and removing OneDrive did not help me, but I found the advice in this article helpful.
I used the PowerShell commands as admin and uninstalled all of the suggested apps save the windows store. Not sure which one finally did it but I don't really care as long as I'm not running at 50 degrees Celsius constantly.

Here is the URL: How To - Fix the Runtime Broker High CPU Usage Error

 

Prevent .NET Runtime Optimization Service from running on battery?

When I opened my laptop this morning, it had rebooted itself (after installing updates). Now the .NET Runtime Optimization Service is using quite a bit of CPU while the computer is on battery. I had the laptop
plugged in overnight but 30% of my battery is gone after less than an hour of usage, which is not the usual situation.

My computer wasn't idle while it was doing this, so I assume its compiling high-priority assemblies after a .Net Framework update from
this article.

I checked the windows update history, and it had installed a monthly cumulative update overnight while plugged in.

I'm wondering, is there any way to ask Windows to defer these tasks until the laptop is plugged in, or to do it before I unplug the laptop?

I wish windows would run the high-priority .net optimisation as part of the overnight install process instead of waiting for me to start using the laptop on battery.